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Obesity in children

Children who carry a lot of excess weight and have too much fat in their body are classed as being obese. It’s mainly caused by regularly consuming more energy (calories) from food and drink than their body uses and not doing enough physical activity.

Obesity means children are more likely to develop serious health problems.

Children need a healthy, balanced diet that gives them enough energy to grow and develop. This means that children usually need to take in more energy than they use and this extra energy forms new tissues as they grow. However, if children regularly take in too much energy, this is stored as fat and they will put on excess weight.

According to the World Health Organization, in 2010, there were around 40 million children under the age of five who were overweight worldwide. In the same year, three out of 10 children aged two to 15 were obese in the UK alone.

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  • Diagnosis Diagnosis of obesity in children

    For adults, a measurement called body mass index (BMI) is often used to work out whether you’re a healthy weight for your height. However, because children are growing, their height, weight and body fat can change a lot. BMI measurements are also very different between boys and girls. This means that the standard BMI can’t be used as a measure for children.

    Special charts, called BMI centile charts, have been developed to show whether children are under or overweight for their age. These charts compare a child’s BMI against other children of the same sex and age. Your GP or nurse will use these charts to assess your child.

    Your GP will also check to see whether your child has other health conditions related to being overweight. Your GP may also ask you and your child about the foods you eat and how active you are.

    Bupa Health Assessment: BMI

    If you are concerned about your BMI, Bupa can help you get a diagnosis.

  • Treatment Treatment of obesity in children

    There are a number of different treatments for obesity in children. However, no treatment will work on its own. You will need to make changes to the foods you and your child eat and the activities you do, as well as changing some of the behaviours of the whole family.

    Depending on the age of your child, your GP may plan to help your child to lose weight. However, weight loss is not always recommended in children so he or she may advise that you help to maintain your child’s weight. Therefore, as your child grows taller, his or her BMI improves but their weight stays the same. Your GP may refer your child to a paediatric dietitian (a specialist in children’s nutrition and health).


    It’s important to make changes that the whole family can do, rather than asking your child to have a separate diet or to start ‘dieting’. This may mean changes to mealtimes and snacking habits, or starting activities that the whole family can do together. Lifestyle changes work best for your child when they are long term, permanent changes.

    Some lifestyle and behaviour changes are listed below.

    • Setting goals and giving rewards and praise. You and your child should be aiming to make long-term changes to the foods you eat and the activities you do. This is so that your child will be able to manage his or her weight when they become an adult. However, choosing some smaller goals to begin with may help you to focus and succeed. Give your child praise and rewards for their success, but make sure these aren’t food-related. Instead, try rewarding them by doing an activity they enjoy.
    • Get active. Children over the age of five need to do at least 60 minutes of moderate to vigorous intensity physical activity every day. This can be one session of activity or a number of sessions of 10 minutes or more. Activities should also include exercises that strengthen their muscles and bones, such as climbing or any activity that means children are lifting their own body weight. Try building activity into everyday life, such as walking or cycling to school or playing with other children. Do activities together as a family, for example, going to the park and playing football. Help your child to choose more structured activities that they enjoy, for example, dancing or swimming.
    • Cut down on inactive pastimes. Reduce the amount of time your child spends watching television or using a computer. Try to limit this to less than two hours a day or 14 hours a week.
    • Eat healthily. Your doctor or dietitian may ask you to keep a record of the food and drink that you and your child have. Based on what your child is eating, what he or she likes and dislikes and how old your child is, your doctor or dietitian may create a healthy eating plan. This can be made up of healthy foods which balance the energy each day that your child is using in their day-to-day activities. This is likely to mean cutting down on foods that have a lot of sugar or fat in them, and eating more fruit and vegetables and low-fat foods.
    • Involve the whole family. It’s important to get everyone to eat healthily and become more active so that your child doesn’t feel that they have been singled out. If you’re overweight, you should lose weight with your child. Look at how you eat as a family, try and sit down together for meals and set a good example with the foods you eat and the activities you do.


    A medicine called orlistat can sometimes be used to help older children lose weight. However, it’s used very rarely and is only usually prescribed in a specialist clinic. Orlistat should only to be given to your child if he or she is over the age of 12, is very obese and has other health problems caused by their weight.


    Weight-loss surgery for children is rare. Surgery will only be suggested if other treatments have failed, if your child has been through puberty or if he or she is very obese and they have other health problems.

    Your doctor will discuss your child’s treatment choices with you.

  • Worried about your BMI?

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  • Causes Causes of obesity in children

    There are a number of different things that can cause obesity in children. Possible causes include:

    • eating a poor diet, for example, too many high-fat and sugary foods
    • inactivity, for example, not doing enough exercise and spending too much time watching television or in front of a computer
    • genetic (inherited) conditions, although these are rare

    Some studies have shown that lifestyle factors during pregnancy and early motherhood may affect your child’s weight, such as smoking and breastfeeding. For more information, see our frequently asked questions.

    If you’re obese, then your children are more likely to be obese. This may happen because you share the same eating or activity habits, or a combination of both.

  • Complications Complications of obesity in children

    If your child is overweight or obese, he or she is more likely to develop serious health problems in the future. Sometimes, early damage can be done and may develop while he or she is still a child, such as development problems in their feet.

    When your child gets older, or becomes an adult, he or she is more likely to develop health problems if they are obese. These include:

    • high blood pressure
    • high cholesterol levels
    • cardiovascular diseases such as heart disease and stroke
    • type 2 diabetes
    • osteoarthritis
    • some cancers, including endometrial, breast and bowel cancer
    • asthma
    • liver disease
    • sleep apnoea

    Obesity can also affect your child’s emotional and mental health. He or she may have low confidence or self-esteem, which may lead to depression. Being obese can also lead to eating disorders, such as bulimia.

  • Prevention Prevention of obesity in children

    Obesity in children is caused by many different things, some of which are difficult to change. For example, there is a greater choice of food available in our shops, and computers and television play a bigger part in many people’s lives than they did in the past. However, you can make a difference to the food your child eats every day and how active they are.

    The National Institute for Health and Clinical Excellence (NICE) recommends the following.

    • Include starchy foods in meals such as potatoes, bread, rice and pasta, choosing wholegrain varieties where possible.
    • Eat plenty of fibre-rich foods, such as oats, beans, grains, fruit and vegetables, wholegrain bread, and brown rice and pasta.
    • Eat at least five portions of a variety of fruit and vegetables each day.
    • Eat a low-fat diet and don’t increase your fat and/or calorie intake.
    • Eat as little as possible of fried foods, sweets which are high in added sugars and fat, and high-fat foods such as takeaway meals or fast food.
    • Reduce the amount of sugary drinks you have, including fruit juices with added sugar, and drink more water.
    • Watch the portion size of meals and snacks, and how often you’re eating.
    • Eat regular meals, including breakfast, in a pleasant, sociable environment without distractions.
    • You should eat with your child and make sure that everyone is eating the same food.
    • Make enjoyable activities – walking, cycling, swimming and gardening – part of everyday life.
    • Minimise sedentary activities, such as sitting for long periods of time watching television, at a computer or playing video games.
    • Encourage active play, for example, dancing and skipping.
    • Be more active as a family, for example, walking and cycling to school and the shops, going to the park or swimming.
    • Encourage your child to participate in sports or other active recreation, and make the most of opportunities for exercise at school.

    Never put your child on a weight-loss diet without getting advice, as this can affect his or her growth. Talk to your GP or a dietitian if you have any concerns about your child's weight.

  • FAQs FAQs

    Are there any medical conditions that can cause childhood obesity?


    Yes, there are certain medical conditions that can cause obesity, but these are rare.


    There are certain medical conditions that can cause obesity in children, but these aren't very common. Most children become overweight or obese because they eat and drink more energy (calories) than they need or are not active enough.

    The following conditions can cause obesity in children.

    • Genetic conditions such as Prader-Willi, Cohen and Bardet-Biedl syndromes.
    • Hormonal conditions, for example, Cushing's syndrome and hypothyroidism.

    If your child does have an underlying medical condition, they will usually have other symptoms in addition to being overweight.

    If you’re worried that your child is overweight, talk to your GP for advice.

    Does my lifestyle during pregnancy and early motherhood increase the risk of my child being overweight?


    There is some evidence to suggest that your health and the choices you make when you’re pregnant and when your baby is born may affect your child’s weight later in life.


    If you’re very overweight during your pregnancy, then your child may be more likely to become overweight as he or she gets older. If you develop diabetes while you’re pregnant (gestational diabetes), this may increase the chances of your child becoming overweight or obese in later life.

    Some research shows that smoking when you’re pregnant may increase the risk of your child being overweight or obese later in life. There are many other ways that smoking can harm an unborn baby too, so if you do smoke you should stop when you’re pregnant. If you do smoke and are pregnant or trying to get pregnant, you should ask your GP for advice.

    There is some research that shows breastfeeding your baby may help reduce the risk of your child becoming overweight as he or she grows up. More recent research only observed this in mother’s who didn’t smoke during pregnancy and who breastfed their child, suggesting that a combination of factors may help reduce the risk of childhood obesity. Breastfeeding has a number of health benefits for you and your baby, but it may not always be an option for every new mother. Talk to your midwife or health visitor about the benefits of breastfeeding and any problems you may be having.

    I'm finding it difficult to get my child to eat healthily. How can I encourage him or her to try new food?


    Children can sometimes be fussy eaters and it can be a challenge to get them to try new things. Try involving your child in preparing meals with you and gradually introduce new foods into your child's diet.


    Children need a healthy, balanced diet to help them grow and stay healthy. The foods they eat should include fruit, vegetables and starchy foods. Encourage your child to choose a variety of foods from an early age. This will help them to get all the vitamins, minerals and nutrients they need.

    There are a number of ways you can introduce new foods in a fun way, and involve your child more in choosing and preparing the foods they eat. Some of the main ones are listed below.

    • Involving your child in preparing and buying food with you will help him or her to get interested in cooking and in different foods.
    • Make your meals a social occasion and eat together as a family.
    • Think about how you present food to your children and make food fun. Offer foods that are fun to eat such as corn on the cob or make a smiling face on a pizza using vegetables. Adding colour and variety to a plate of food helps to get children more interested.
    • Cook your children’s food in a way that reduces the fat content, for example, by grilling or steaming it. Try replacing food like fish fingers with a portion of oily fish such as sardines or salmon. Boys can have up to four portions of oily fish a week, but girls should only have two portions a week.
    • Encourage your child to eat more fruit and vegetables by offering them a variety each day. If your child doesn’t like the texture of cooked vegetables, try raw carrots, cucumber and other vegetables instead. As well as fresh fruit, dried fruit and juices also count towards your child’s daily portions. For example, you can give your child a glass of fruit juice with their breakfast and chop up some fruit for a snack later on in the day. Aim to give your child three of their five-a-day as vegetables and the other two portions can be fruit.
    • Offer your child a sweet and savoury dish at lunch and dinner time so that they have several opportunities to try different types of foods with a variety of nutrients.
    • When you offer your child a new food, show it to them first and tell them about it. Then, at a later meal, give them some to try. If he or she doesn’t like it, then don’t try and force them to eat it. Try it again at later meals. It can sometimes take a few tries before a child will accept a new food.

    Try not to turn mealtimes into a confrontation over food as this is likely to make things worse. Instead keep offering different and new foods regularly.

  • Resources Resources

    Further information


    • 10 facts on obesity. World Health Organization., published May 2012
    • Obesity and overweight. World Health Organization., published May 2012
    • Management of obesity. Scottish Intercollegiate Guidelines Network (SIGN). February 2010.
    • Children. British Nutrition Foundation., accessed 12 November 2012
    • Facts and figures on obesity. Department of Health., published 30 April 2012
    • Childhood overweight and obesity. World Health Organization., accessed 9 November 2012
    • Risk factors for sleep apnea. eMedicine., published 20 June 2011
    • Armstrong J, Reilly JJ. Breastfeeding and lowering the risk of childhood obesity. The Lancet 2002; 359(9322):2003–04. doi:10.1016/S0140-6736(02)08837-2
    • von Kries R, Toschke AM, Koletzko B, et al. Maternal smoking during pregnancy and childhood obesity. Am J Epidemiol 2002; 156(10):954–61. doi:10.1093/aje/kwf128
    • Causes and risk factors. National Obesity Forum., published 13 June 2006
    • Reilly JJ, Armstrong J, Dorosty A, et al. Early life risk factors for obesity in childhood: cohort study. BMJ 2005; 330:1357. doi: 10.1136/bmj.38470.670903.E0
    • Kipping RR, Jago R, Lawlor D. Obesity in children. Part 1: epidemiology, measurement, risk factors and screening. BMJ 2008; 337:a1824. doi:10.1136/bmj.a1824
    • Obesity. National Institute for Health and Clinical Excellence (NICE), December 2006.
    • Setting goals. National Obesity Forum., published 9 May 2006
    • An approach to weight management in children and adolescents (2–18 years) in primary care. Royal College of Paediatrics and Child Health. National Obesity Forum., published 13 June 2006
    • Start active, stay active: a report on physical activity from the four home countries' Chief Medical Officers. Department of Health. 2011.
    • Personal communication, Bianca Parau, Senior Paediatric Dietitian, Bupa Cromwell Hospital, 15 January 2013
    • Cooking with children. KidsHealth., published July 2011
    • Children's diet – fruit and vegetables. Better Health Channel., published August 2011
    • Healthy eating for children. British Dietetic Association. May 2007.
    • Strategies for feeding a preschooler. KidsHealth., published June 2011
    • Smoking and reproduction. Ash., published February 2011
    • 10 facts on breastfeeding. World Health Organization., published July 2012
    • About Prader-Willi syndrome. Foundation for Prader-Willi Research., accessed 19 November 2012
    • Cushing's disease. The Pituitary Foundation., accessed 19 November 2012
    • Hypothyroidism. The British Thyroid Association., published 2007
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