Tag Archives: Millennium Cohort Study

Wheezing: Can breastfeeding for longer make a difference?

Public health bodies put a lot of effort into encouraging mothers to breastfeed, and for good reasons. Successive studies have shown breastfeeding has a range of health benefits, including a lower risk of wheezing illnesses, which can be linked to asthma. But which of these illnesses are most likely to respond? Is a breastfed child less likely to develop wheezing after age five, or age seven, for instance? Or is the protective effect mainly measurable only in younger children? Professor Maria Quigley from the National Perinatal Epidemiology Unit at the University of Oxford, along with colleagues at Oxford and UCL, has been looking at how and when breastfeeding is associated with wheezing.

Asthma is the most common chronic condition affecting children and young people in the UK. It’s the most common reason why children are admitted to hospital, and sadly each year a few still die from the condition. According to the British Lung Foundation three children in every hundred under the age of five have been diagnosed with asthma at some point; and by age 10 that figure rises to one in 10.

There’s no cure, and so the priority for public health bodies has been to understand the disease better, to manage it better and to learn more about the factors that can protect us from it. One such protective factor is breastfeeding: two recent pieces of research have shown there is a lower risk among breastfed children, but that the effect is stronger among the very young – both for asthma and for wheezing, which has many causes and which does not necessarily develop into asthma.

Childhood wheezing can follow a variety of patterns – it can set in early but clear up before adulthood, for instance, or it can start later but continue into later life. Some wheezing will start in childhood and will continue.

Millennium Cohort Study

We wanted to look at how breastfeeding might affect these different types, so we used data from the Millennium Cohort Study, which has followed the lives of almost 19,000 children born in the UK between September 2000 and January 2002. Their parents were interviewed when they were 9 months old, and again when they were 3, 5, 7 and 11 years.

Our study focused on just over 10,000 children who were seen at all of those points and who were the product of single as opposed to multiple birth. Mothers were asked whether they had tried to breastfeed, and for how long their children had been breastfed.

Among our sample, seven out of 10 children had been breastfed: a little more than one in ten of the study sample for less than a week; a fifth for between one and three weeks, just over one in six for three to six months and around a quarter for six to nine months.

We found that at age 9 months, 6.5 per cent of children had a history of wheezing. At age 3 years, 19.5 per cent had such a history in the past year. As the children got older, though, this proportion decreased – 16 per cent at age five, 11.8 per cent at age seven and 11.4 per cent at age 11.

Overall, 37 per cent of children had suffered from wheezing at least once between 9 months and 11 years. A little under a fifth (18.8 per cent) had wheezing at younger age which cleared up when they got older, while 6.2 per cent had wheezing which started later and 11.8 per cent had persistent wheezing.

Feeding and wheezing

When we looked at the association between breastfeeding and wheezing, we found the children who had been breastfed for longest were less likely to suffer from wheezing.

But this effect lessened with time. For example, those breastfed for six to nine months were less likely to wheeze between the ages of nine months and five years, but by the age of 11 this group had no significant advantage over those who were breastfed for less time.

What does our study tell us about the relationship between breastfeeding and wheezing? The picture is a complex one. There are many causes of wheezing and of asthma, and those causes change over time. So in order to draw firm conclusions about cause and effect, we would need a much more complex dataset. It would be interesting, for instance, to look at clinical information on children’s allergies or their lung function.

But what we can say is that age matters – in order to understand how breastfeeding affects the development of wheezing during childhood, we must take a longer and more nuanced view.

Breastfeeding And Childhood Wheeze: Age-Specific Analyses and Longitudinal Wheezing Phenotypes as Complementary Approaches To The Analysis Of Cohort Data is research by Maria Quigley (University of Oxford), Claire Carson (University of Oxford) and Yvonne Kelly (UCL). It is published in the American Journal of Epidemiology.

Calling time on a life of likes could be key to girls’ happiness

There have been increasing calls in recent months for more to be done to prepare children for the emotional demands of social media. Just a few weeks ago, the Government’s Science and Technology Committee announced an inquiry into the impact of social media on the health of young people. But do girls and boys use social media as much as each other and is all this time spent Facebooking, Whatsapping and Snapchatting having a detrimental effect on their happiness and well-being? Cara Booker from the University of Essex, in collaboration with collleagues from UCL, has been looking at trends in social media interaction and well-being in nearly 10,000 10-15 year-olds in the UK over a 5 year period. Their findings indicate that girls may be at greater risk and therefore a focus for those looking to intervene to protect and promote children’s happiness.

The Government’s inquiry into the impact of social media on the health of young people comes hard on the heels of a report from the Children’s Commissioner for England, which says that children between the ages of 8 and 12 find it hard to manage the impact of online life and become anxious about their identity as they crave ‘likes’ and comments for validation. 

An explosion in digital and social media platforms has revolutionised the way we all consume media with a recent report showing that young people aged 12-15 spending more time online than they do watching TV. Indeed, it seems a long time ago that parents’ prime concern around media was how much or what kind of TV their child was watching.

All these major developments have taken place at a time when we also know that young people are becoming less and less happy. In the most recent United Nations Children’s Fund report, UK adolescents are ranked in the bottom third on overall well-being, below Slovenia, the Czech Republic and Portugal.

Of course, it’s important to remember that the internet has done a great deal of good for children: connecting them with friends and family who may be far away, providing great opportunities to widen horizons and learn new things. These things have been shown in other studies to be linked with increased levels of happiness and well-being in children

On the negative side, social media use has been linked with obesity, cyberbullying, low self-esteem and lack of physical activity, all things that can affect the lives of children as they move through school and into adulthood and work.

Social media experiences

Young people who took part in the Understanding Society survey, were asked if they belonged to a social web-site and then how many hours they spent ‘chatting’ or ‘interacting with friends’ on a normal school day. They could select a range of responses from none to more than 7 hours.

At age 10, 50 per cent of girls and 55 per cent of boys said they had no internet access or spent no time on social media. At 15 years, this dropped to 8 and 10 per cent respectively.

Ten per cent of ten year old girls reported spending one to three hours a day (compared with 7 per cent of boys) and this increased to 43 per cent of girls at age 15 (and 31 per cent of boys).

At age 10 only a very small percent of girls/boys were spending 4 hours plus a day on social media. But by the age of 15, that rose to 16 per cent of girls and 10 percent of boys.

Levels of happiness 🙂 🙁

Young people who took part in the survey were asked about satisfaction with schoolwork, friends, family, appearance, school and life as a whole and this was used to create an overall happiness score for them.

They were also asked about any social and emotional difficulties they might be facing using the well-established Strengths and Difficulties Questionnaire (SDQ) with a higher score indicating more problems.

For both boys and girls, levels of happiness decreased between the ages of 10 and 15, however the decrease was greater for girls than for boys. Additionally, whilst SDQ scores increased for girls between the ages of 10 and 15, they decreased for boys.

10 year-old girls who spent an hour or more on a school day chatting online had higher SDQ scores (more social and emotional problems) than girls of the same age who spent less or no time on social media. In addition, the score (number of problems) increased as they got older.

Why the gender difference?

So why the gender difference? This is hard to unpick and not something we were able to look at specifically in our research. It may say something about the different ways that girls and boys interact with social media. For example, girls may be more likely than boys to compare their lives with those of friends and peers – whether those are ‘filtered’ selfies or positive posts about friendships, relationships or material possessions – these could lead to feelings of inadequacy, lower levels of satisfaction and poorer wellbeing.

The pressures associated with having peers like or ‘approve’ status updates and a perceived fall in or lack of popularity could add further pressure at, what for many teenagers is a tricky time in their lives.

Boys are more likely to be gaming than interacting online in the way just described and that wasn’t covered in this research, so it’s possible that changes in well-being may be more related to gaming success or skill.

What needs to change?

It’s clear that social media is no short-lived phenomenon and our research indicates that girls, possibly because of the way in which they interact online and the amount of time they spend doing so could be at greater risk.

In her report, A Life of Likes, the Children’s Commissioner Anne Longfield has called for more to be done to check and stop underage use and to prevent children becoming over dependent on likes and comments and “adapting their offline lives to fit an online image”, something she believes can lead to an anxiety about ‘keeping up appearances ‘ as they get older.

Our research really adds weight to recent calls for the technology industry to look at in-built time limits. Young people need access to the internet for homework, for watching TV and to keep in touch with their friends of course, but a body of evidence is emerging to show that substantial amounts of time spent chatting, sharing, liking and comparing on social media on school days is far from beneficial especially for girls.

Gender differences in the association between age trends of social media interaction and wellbeing among 10-15 year olds in the UK, is research by Cara Booker (University of Essex), Yvonne Kelly (University College London) and Amanda Sacker (University College London) and is published in BMC Public Health.

Off the scales: time to act on childhood obesity

By 2050, it is said that obesity could cost the NHS almost £10 billion a year, with the full economic cost rising from around £27 billion today to £50 billion by then. Today, the Centre for Social Justice (CSJ) publishes its report, Off the scales: time to act on childhood obesity. It calls on the Government to put prevention, health, inequality and cross-departmental collaboration at the heart of its efforts to tackle childhood obesity, drawing particular attention to the need to address the question of why poorer children are at ever greater risk of being obese. It’s a question researchers at the ESRC International Centre for Lifecourse Studies at UCL, including our editor Yvonne Kelly, have been among the first to address.

There have been numerous major studies on childhood obesity over the past 10 years, many of which have shown the links with poverty. But our research looks specifically at why children from disadvantaged families are significantly more likely to be obese than their better off peers.

To examine this as robustly and rigorously as we could, we used data from the Millennium Cohort Study (MCS) which has tracked the lives of nearly 20,000 children from across the UK since the turn of the century. Using a range of measurements taken when the children were aged 5 and 11 together with detailed information about their backgrounds and family circumstances, we were able to demonstrate just how key poverty was in respect of their obesity.

At age 5, poor children were almost twice as likely to be obese compared with their better off peers. By the age of 11, the gap had nearly tripled.

Knowing as we do that obese children are less likely than their peers to grow into economically successful adults and that obesity is clearly linked with a range of chronic diseases, it’s reasonable to say that for these children, the future is far from bright. From a policy perspective it is also clear that unless the gap between rich and poor children can be closed the chances of reducing the overall obesity trend, as the Government states it is committed to doing, are pretty slim.

How is poverty linked to obesity?

The MCS collects a broad range of data, allowing us to dig beneath these headline numbers to tease out some of the specific ways in which relative poverty in childhood leads to an increased risk of obesity.

To examine this question of whether a parent’s own lifestyle might have a role, we looked at factors previously shown to be linked to the increased risk of obesity, such as whether the mother smoked during pregnancy, how long she breastfed for and whether the child was introduced to solid food before the age of four months.

We could also factor in the degree to which a mother was herself overweight or obese and assess children’s physical behaviour, such as how often they exercised, played and how many hours they spent watching TV or playing on a computer, and the time that they went to bed. We looked at whether the child skipped breakfast, how much fruit they ate and how often they had sweet drinks.

A lot of these factors were relevant. A mother’s behaviour when her child was very young was certainly important. Markers of an ‘unhealthy’ lifestyle here could mean as much as a 20 per cent additional risk of obesity for a child.

Obese and overweight children living in poor families were more likely to have mothers who did not breastfeed or breastfed for a shorter duration, who introduced solid foods early in infancy, who smoked during pregnancy, and who were overweight or obese. The poorest children were also more likely to spend more time watching TV and using a PC (and so have greater exposure to food and drink advertising), experience later and more irregular bedtimes, do less sports and be more physically inactive, engage less in active play with their parent, live in an area without a playground, and not have breakfast every day.

5-year-olds from poorer families were also much more likely to gain excess weight up to age 11 than richer children, leading us to conclude that the earlier certain risk factors can be challenged and the appropriate support provided for the least well off families, the greater the chance of positive impact on the risk of obesity and in a reduction in inequality.

Pathways to obesity

More recently we have identified four BMI trajectories for children. The good news is that 80 per cent of them are on a stable path where, on average, from when they’re born through to age 11, they are not overweight.

There is a small group of children who are obese at age 3 but then join the stable group by age 7. We call them the ‘decreasing’ group. There is a ‘moderate increasing group’ (13.1 per cent) where children are not overweight at age 3 but whose BMIs increase throughout childhood into the overweight (but not obese) range. Finally we have a ‘high increasing’ group of children (2.5 per cent) who are obese at age 3 and whose BMI continues to increase.

From an inequality perspective, what’s most striking here is that the wealthiest children are least likely to be in the ‘moderate increasing’ BMI group whilst the poorest children are more than twice as likely to be on the high increasing path.

Today’s CSJ report agrees with our analysis that early intervention is key and, in line with it, proposes three key early years intervention opportunities to ensure children get the healthiest start possible before they reach primary school age.

The report acknowledges that the Government is already trying to persuade families to eat more healthily and take more exercise. But it has joined a body of voices critical of the Childhood Obesity Plan, which, it believes, “fails to put reducing inequality as a goal … despite acknowledging that the childhood obesity burden falls hardest on the poorest children.”

Certainly our body of evidence indicates that policy makers need to acknowledge and address inequality as a root cause of obesity. Doing something about the structural factors in people’s lives is what is needed rather than ‘tinkering around the edges’ of the problem.

Today the CSJ asks why there are disproportionately high levels of obesity, particularly childhood obesity, in our most deprived communities. Our research has gone some way to answering that question, and makes it clear that there is no simple one-stop shop solution.

Obesity is caused by a combination of environmental, biological, cultural and psychological factors, where one factor does not dominate and yet our obsessional search for the ‘one thing’ that can tackle obesity continues. If the Government is going to reduce obesity rates, it will indeed, need to introduce multiple bold measures in tandem across the entire ecosystem and recognise that success may only be measurable after a few years.

Why are poorer children at higher risk of obesity and overweight? A UK cohort study is research by Alice Goisis, Amanda Sacker and Yvonne Kelly and is published in the European Journal of Public Health

BMI Development and Early Adolescent Psychosocial Well-Being: UK Millennium Cohort Study is research by Yvonne Kelly, Praveetha Patalay, Scott Montgomery and Amanda Sacker and is published in Pediatrics

An equal start: longitudinal evidence to support children’s healthy development

Using longitudinal evidence to support children’s healthy development and give them an equal start in life is the subject of our editor Yvonne Kelly’s keynote address at the Growing up in Ireland Annual Conference in Dublin today.

Her talk discusses findings from the most recent of the British ‘birth ‘ cohort studies – the Millennium Cohort Study that have so far informed policy development. They include work by researchers at the ESRC Centre for Lifecourse Studies where Yvonne is based on alcohol consumption during pregnancy, breastfeeding and the introduction of solid foods, the physical punishment of children , childhood obesity, reading to children in the early years, and sleep patterns throughout childhood.

She will also share work with the potential to inform future policy challenges such as young people’s drinking, social media use and mental health.

Ahead of her talk, she said:

“It is well established that what happens in the early years of life has long-lasting consequences for health and social success across the lifespan. Stark social inequalities in children’s health and development exist and emerge early in life. It is therefore crucial to identify potential tipping points and opportunities for intervention   during childhood with the potential to affect change and improve life chances.”

 

 

Don’t let the kids get jet-lag: why regular bedtimes are key to a happy healthy childhood

The very best of sleep medicine and research is being presented at the World Sleep Congress in Prague this week. Among that research are findings from work by Child of our Time Editor, Professor Yvonne Kelly and colleagues at the ESRC International Centre for Lifecourse Studies. They have been trying to find out what it is about sleep that matters most when it comes to giving children the best possible start in life. Here Yvonne explains what they have found to date and why regular bedtimes are key to a healthy happy childhood.

What happens in the early years has profound implications for what happens later on in life. Thousands of research papers, many of them using the wonderful rich data in the British Birth Cohort studies, have documented the enduring impacts of the way we live our lives as children on how we fare later on. Children who get a poor start in life are much more likely to experience poor outcomes as adults, whether that’s to do with poor health or their ability to enjoy work and family life later on.

So what has all that got to do with getting enough sleep as a toddler you might ask? Well our research shows it is one of a number of important factors related to getting children off to the best possible start in life and here’s why.

Recommended sleep

The National Sleep Foundation recommends that toddlers should get around 11 to 14 hours sleep every day. For 3-5 year-olds, the recommendation is 10-13 hours and it suggests 9-11 hours for children once they’re at primary school. But is it all about the number of hours sleep children get, or is there more to it than that? Those are the questions we have been addressing in our research into children’s sleep and how it ties in with how they get on at home and at school across the first decade of their life.

Digging into one of those studies mentioned earlier, the Millennium Cohort Study, which has followed the lives of some 20,000 children since the turn of the century, we found that it’s not just the number of hours a child sleeps that matters, but also having consistent or regular bedtimes.

First we looked at the relationship between regular and irregular bedtimes and how the children got on in a range of cognitive tests. The results were striking. Children with irregular bedtimes had lower scores on maths, reading and spatial awareness tests.

Parents who took part in the MCS were asked whether their children went to bed at a regular time on weekdays. Those who answered “always” or “usually” were put in the regular bedtime group, while those who answered “sometimes” or “never” were put in the irregular bedtime group.

Interestingly, the time that children went to bed had little or no effect on their basic number skills, and ability to work with shapes. But having no set bedtime often led to lower scores, with effects particularly pronounced at age three and the greatest dip in test results seen in girls who had no set bedtime throughout their early life.

The key to understanding all this is circadian rhythms. If I travel from London to New York, when I get to there I’m likely to be slightly ragged because jet lag is not only going to harm my cognitive abilities, but also my appetite and emotions. That’s for me, an adult. If I bring one of my children with me and I want them to do well at a maths test having just jumped across time zones, they will struggle even more than I will. The body is an instrument, and a child’s is especially prone to getting out of tune.

The same thing happens when children go to bed at 8 p.m. one night, 10 p.m. the next and 7 p.m. another — we sometimes call this a “social jet lag effect.” Without ever getting on a plane, a child’s bodily systems get shuffled through time zones and their circadian rhythms and hormonal systems take a hit as a result.

Bedtimes and behaviour

Having established the importance of sleep to a child’s intellectual development, we turned our attention to the relationship between regular bedtimes and their behaviour.

At age 7, according to parents and teachers, children in the MCS who had irregular bedtimes were considerably more likely to have behaviour problems than their peers who had a regular bedtime. In addition, the longer a child had been able to go to bed at different times each night, the worse his or her behaviour problems were. In other words the problems accumulated through childhood.

One really important piece of good news was that we found that those negative effects appeared to be reversible, so children who changed from not having to having regular bedtimes showed improvements in their behaviour. There seems to be a clear message here that it’s never too late to help children back onto a positive path and a small change could make a big difference to how well they get on. Of course, the reverse was also true so the behaviour of children with a regular bedtime who switched to an irregular one, worsened.

Bedtimes and obesity

In a follow up study, which looked at the impact of routines including bedtimes on obesity, we reported that children with irregular bedtimes were more likely to be overweight and have lower self-esteem and satisfaction with their bodies.

In fact, of all the routines we studied, an inconsistent bedtime was most strongly associated with the risk of obesity, supporting other recent findings which showed that young children who skipped breakfast and went to bed at irregular times were more likely to be obese at age 11.

Even children who ‘usually’ had a regular bedtime were 20 per cent more likely to be obese than those who ‘always’ went to bed at around the same time.

So we have a body of robust evidence now that shows very clearly that regular bedtimes really matter when it comes to a child’s health and development over that important first decade of their life.

Providing that evidence in the form of advice to parents and all those caring for young children alongside recommended hours of sleep could make a real difference, helping protect our children from ‘social jet-lag’ and getting them off to a flying start instead.

Why reading is key to giving our kids a great start in life

A growing body of research is pointing to how important and valuable reading is in giving children the best possible start in life, not just for academic success but more broadly including for a child’s mental health and happiness.

In this special episode of the Child of our Time Podcast, Professor Yvonne Kelly is joined by Jonathan Douglas, CEO of the National Literacy Trust and researcher Christina Clark, also from the  Trust. They discuss important new evidence about the benefits of reading for individual children and in addressing social inequalities.

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Do mental health problems have their roots in the primary school years?

Recent reports have shown worrying rises in young people suffering from mental health problems. A study for the Department of Education showed more than a third of teenage girls reporting depression, anxiety and low self-esteem. To try to understand this growing problem, Dr Afshin Zilanawala and fellow researchers from the ESRC International Centre for Lifecourse Studies at UCL have investigated how certain aspects of learning in the primary school years and success affect the behaviour and wellbeing of early adolescents.

Young people who drink, smoke and have behavioural problems are known to be at risk of suffering poor health as adults.

Understanding what causes this risky behaviour, and the anxiety and low self-esteem associated with it, can help professionals to target those most likely to drop out of school, become pregnant as a teenager, become obese or to suffer other long-term health issues.

By planning support and prevention programmes during childhood, they can improve the likelihood of a successful and healthy adulthood for our most vulnerable young people, and reduce the pressure on health and social services.

Mental health

A recent YouGov survey of Britain’s university students revealed that more than a quarter of them report depression and poor mental health.

But could the roots of these problems be found by looking more closely at how children develop and learn throughout the primary school years?

Information on more than 11,000 children collected by the UK Millennium Cohort Study (MCS) was used in our research, which explores the links between children’s verbal abilities and their behaviour and well-being as they make the move to secondary school.

Using information collected at ages three, five, seven and 11, we were able to see how well they could read, the range of their vocabulary and their verbal reasoning skills.

Then, at age 11, the children were asked about their school work and life, their family and friends and their appearance. There were questions about how happy they were, whether they felt good about themselves. They were also asked if they had tried cigarettes or alcohol, and if they had stolen anything or damaged property.

Verbal performance

In terms of how well they were getting on, the children were divided into three groups (low, average and high verbal achievers).

This in itself produced a startling and worrying view of the diverging paths these different children follow over time, particularly between the ages of seven and 11. One in five of the children (the high achievers) did better and better at the verbal tests, stretching away from their peers as they prepared to head to secondary school. The majority (around three quarters) of children were on the middle path, making steady progress but then plateauing off. But, most striking of all was what happened to the low achieving group (around one in 17 of the children), whose verbal abilities declined steeply.

Verbal ability

Millennium Cohort Study

Having established these pathways, we went on to look at which children at age 11 were involved in risky behaviours and then to dig deeper to see how these behaviours related to their progress to date. We also looked at what other factors, especially those related to their family circumstances, might be at play.

Boys were more likely than girls to be smoking and drinking or getting involved in anti-social behaviour. Girls were more likely to suffer from low self-esteem. First-born children were happier and had higher self-esteem, and were less likely to smoke, drink and have problem behaviours than second or later birth-order children. Children with younger mums were also more likely to engage in risky behaviour.

Those from disadvantaged backgrounds and those with more unsupervised time were more likely to suffer from poor mental health. We also found those whose mothers suffered from depression were more at risk of mental health problems.

Looking at the raw data, the low achieving children were three times more likely to smoke than their high achieving peers and twice as likely as the average group. Low achieving and average achieving children were also more likely to drink.

One in three of the low achieving children compared with one in five of the high achievers had been involved in anti-social behaviour and were more than four times more likely to have behaviour problems as reported by their parent. They also had much lower levels of self esteem.

Family factors

When we took a range of family factors into account including the child’s age and gender, mother’s age and mental health and socioeconomic circumstances, many or all of the differences between the groups disappeared or became smaller, confirming the overriding importance of the family and social environment.

However, we can say, for the first time, and with considerable confidence, that how well children are reading, talking and reasoning, can and does influence their health and well-being as they become adolescents. Indeed, we found clear evidence that children who were performing below average in this area across childhood were more at risk of poor mental health and risky behaviour than their consistently above-average performing peers.

If we want those children to stand a better chance of a healthy and happy life, we need to focus a great deal of attention on what is happening at home and at school in those early years, particularly, our research would seem to show, between the ages of 7 and 11.

Our results are consistent with other research, which demonstrates the huge challenge for young people with poor verbal skills, who arrive at the doorstep of adolescence with mental health, self-esteem and behavioural issues, which are likely to continue into adult life.

Recent reports that child poverty figures in the UK are continuing to rise, despite successive Governments’ promises to reduce them, does not bode well in this context. Indeed, it would seem to indicate that it will be some time before the yawning gaps in inequality that we see at primary school and their knock-on effects on children’s wellbeing in adolescence can be closed.

Longitudinal Latent Cognitive Profiles and Psychosocial Well-being in Early Adolescence is research by Afshin Zilanawala, Amanda Sacker and Yvonne Kelly and is published in the Journal of Adolescent Health

Photo credit: Creative curriculum  US.Army

 

Screen use at seven: overweight at 11. Why it’s time to say no to a TV in the bedroom for children

Since the launch of the Childhood Obesity Strategy in 2016, there has been much attention focused on the so-called ‘Sugar Tax’. The March 2017 Budget saw confirmation that sugary soft drinks would be taxed in an attempt to combat rising levels of obesity. This is an important move that has been met with widespread approval from public health professionals. Still, obesity is hugely complex and there are many other things at play in addition to the sugary drinks and snacks that children may consume. Researchers at UCL have been looking in detail at different factors associated with obesity and, in a recent paper, find that children who have a television in their bedroom have higher BMI and more body fat than those who do not. Lead researcher, Anja Heilmann, explains the research and why saying no to a TV in the bedroom could be another important strategy in combatting childhood obesity.

As our TV screens have got flatter, our children have got fatter. There is no getting away from it! Screen-based activities play a central role in our children’s lives. At a very young age, they have unparalleled access to television screens, computers, game consoles and a host of mobile devices. Among 5 to 11 year-olds, TV is still the most consumed medium, with gaming coming second.

At the same time, childhood obesity is not just a national, but a global health worry. In 2014/15 a third of 11 year-old children in England were overweight and a fifth were obese.

Research has repeatedly reported a link between TV viewing and obesity, but although some has hinted at the idea that a television in a child’s bedroom might exacerbate the problem, the evidence here has been rather contradictory. Other plausible pathways could include eating unhealthy snacks whilst watching TV, exposure to food advertising and insufficient and poor quality sleep.

Using information from the Millennium Cohort Study (MCS), which has followed the lives of more than 18,000 children born around the turn of the century, we had the opportunity to see whether having a TV in their bedroom when they were age 7 was, in any way, linked with a child being overweight when they were 11 years old. In other words, we wanted to get to grips with whether there were implications over a child’s lifetime of their screen use and if so, what those implications were.

Useful information

Using trained interviewers, the MCS collects a wide range of useful information including the independently measured height, weight and body fat of a child. These provided us with a set of obesity-related measurements: weight, Body Mass Index (BMI) and Fat Mass Index (FMI), a powerful set of measures for overweight and obesity.

When the children were age seven, parents were asked if their son or daughter had a TV in their bedroom, how many hours they spent watching TV or DVDs and how much time they spent playing on a computer.

 At age 7, more than half of the 12,556 boys and girls we looked at in our research had a TV in their room and it was these children who were more likely to be overweight when they turned 11 when we compared them with those without a TV. They were also more likely to have higher BMI and FMI. In total, a quarter of the boys and nearly a third of the girls were overweight at age 11 and the links between having a TV in the bedroom and overweight were stronger for the girls.

Another strength of the research is that we controlled for the child’s BMI at age 3 and maternal BMI, that way adjusting for genetic factors, as well as food environment in the family. We also adjusted for family income and mother’s education – both of which are important as overweight/obesity is socially patterned, as is TV use.

Interestingly, there was no link between overweight and the time a child, whether they were a boy or a girl, spent playing on a computer.

Clear link

So, given the size of our sample and the robustness of the methods employed here, we can say with considerable confidence that there is a clear link between having a TV in the bedroom as a young child and being overweight a few years down the line. For girls, this represents a 30 per cent increase in the risk of being overweight at 11 compared with their peers who do not have one. For boys the risk increases by around 20 per cent.

Another interesting point to note is that the size of this risk or effect is about the same as that of other things shown to be linked with obesity, such as not being breastfed and being physically inactive.

Nevertheless, policy makers looking to create and implement strategies to reduce obesity should certainly consider building access to television screens in children’s bedrooms into their thinking. Specific initiatives focused on young girls could also be important.

Meanwhile, for parents who may consider it a good idea for a young child to have their own TV in their bedroom or feel under pressure to provide one, the message is quite clear: resist the idea and you may be doing even more to set your child on a healthier path into their teenage years and beyond.

Longitudinal associations between television in the bedroom and body fatness in a UK cohort study is research by Anja Heilmann, Patrick Rouxel, Emla Fitzsimons, Yvonne Kelly, and Richard Watt and is published in the International Journal of Obesity.

Tackling the childhood obesity epidemic: Can regular bedtimes help?

Nearly one in five 10 and 11-year-olds in England is obese, according to NHS figures. With childhood obesity posing not just a nationwide, but a worldwide health threat, public health researchers around the globe are striving to establish which aspects of a young child’s life might set them on a path to being obese later on. Associate Professor Sarah Anderson from The Ohio State University College of Public Health and colleagues from University College London outline the first research to try to disentangle the role of children’s routines and behaviour at age 3 on obesity at age 11 and show that bedtime routines and learning to manage emotions really do matter.

The UK’s Chief Medical Officer Professor Dame Sally Davies has warned that the health of millions of children is in jeopardy and is concerned that being overweight is becoming the norm. She fears half the population could be obese by 2050 at a cost of billions of pounds to the health service and wider economy.

The latest statistics highlight a stark contrast between the wealthiest and poorest families, with childhood obesity rates in the most deprived areas more than double those in the most affluent areas.

Despite the publication in August 2016 of the Government’s long-awaited childhood obesity strategy, charities and health organisations remain highly critical, describing it as a watered-down effort that puts business interests ahead of those of public health. Even the recent introduction of the so-called ‘sugar-tax’ on soft drinks has been met with scepticism in some quarters.

To help inform public health strategies going forward, our researchers looked at the bedtime, mealtime and tv/video routines of very young children and their emotional and behavioural development to see if, at this early stage, it is possible to identify those most at risk of becoming obese.

The study includes information on nearly 11,000 children collected through the UK Millennium Cohort Study (MCS). When the children were three, their parents reported whether children always, usually, sometimes, or never or almost never had a regular bedtime and mealtime, and the amount of television and video they watched each day.

They were also asked a series of questions about the child’s behaviour during the previous six months. Questions were about how children cope with emotions and their persistence and independence in play, including how easily the child became frustrated and whether they sought help from adults when faced with a difficult task. This was to get an idea of how well the child was able to ‘self-regulate’ their behaviour in these areas.

Regular routines

Children with regular bed and mealtimes and who watched less television were better able to control their emotions than their peers with less regular and consistent routines.

At 11-years-old, 6.2 per cent (682) of the children in the MCS were obese, with obesity more common in lower income and less educated families.

Of the routines we studied, inconsistent bedtime was most strongly associated with the risk of obesity, supporting recent findings by our UCL colleagues which showed that young children who skipped breakfast and went to bed at irregular times were more likely to be obese at age 11, stressing the importance of adequate sleep for preventing childhood obesity.

Even children who ‘usually’ had a regular bedtime were 20 per cent more likely to be obese than those who ‘always’ went to bed at around the same time.

Regular bedtimes and obesity

Surprisingly, toddlers with irregular meal times had a lower risk of obesity at age 11. Once other routines were factored in, television viewing was not related to obesity, although it is important to note that computer use was not taken into account, and the media environment for young children today is different than it was when children in MCS were young.

There was also a clear link between lower levels of emotional self-control in early childhood and obesity later on. Children with poor emotion regulation at age 3 were over 50 per cent more likely to be obese when studied at age 11.

Children’s level of persistence and independence was not linked to later obesity, however, and it is possible that this could be explained by the relative immaturity of the parts of the brain responsible for a child’s cognitive compared with their emotional development at this young age.

Strongest risk

Our study is the first to look at the relationship between a child’s routines, their ability to regulate their emotions and behaviour and how these factors work together to predict obesity.

The two strongest risk factors for obesity were irregular bedtime and a poor ability to control emotions and these were completely independent of each other. In other words, the link between bedtimes and obesity could not be explained away by a child’s inability to regulate their emotions.

There is a need to look more closely at the timing and regularity of children’s mealtimes and how they impact obesity later on, as we think there may be a lot more factors at play than we have considered here. We also need to better understand how the development of emotional and cognitive self-regulation interacts with metabolic, behavioural and social pathways to obesity.

However, our study supports previous research showing that children’s emotional regulation develops within a family context which includes routines.

One message from our study is crystal clear. To be effective, obesity strategies must target early childhood, and must find a way to support parents, especially those from the most deprived areas, to introduce and maintain consistent bedtimes and other home routines, as well as help children regulate emotions and respond to stress.

Another key message is that one size does not fit all. There is a lot going on in children’s lives that is important for their health and development. Saying that, it would seem that getting our children to bed at the same time every night could be a simple, cost-effective tool in the tool-kit to get them off to a good start and maybe in the larger battle against obesity.

Self-regulation and household routines at age three and obesity at age 11: Longitudinal analysis of the Millennium Cohort Study is research by Sarah Anderson from The Ohio State University College of Public Health; Amanda Sacker and Yvonne Kelly from University College London and Robert Whitaker of Temple University, Philadelphia.

Reducing harm from alcohol consumption

Child of our Time editor Yvonne Kelly has shared her latest research findings on very young drinkers with policy makers, senior health professionals and third sector groups.

Yvonne was  part of a high profile panel presenting research and taking questions from MPs and others with an interest in the creation of a strategy to reduce harm from alcohol consumption.

The event, organised by The All-Party Parliamentary Health Group and CLOSER (the UK Longitudinal Studies Consortium), comes as a recent report from Public Health England stated that among those aged 15 to 49 in England, alcohol is now the leading risk factor for ill-health, early mortality and disability and the fifth leading risk factor for ill health across all age groups.

It has also been acknowledged that the harmful effects of heavy alcohol consumption go well beyond the implications for public health, presenting both serious economic and social challenges: current estimates of the annual cost to society of alcohol consumption range from 1.3% to 2.7% of annual GDP. In addition, around half of all violent incidents involving adults are alcohol-related.

Photo credit: Jes 

You can find more articles about Yvonne’s research on young people and alcohol by typing ‘alcohol’ into our blog Search bar.