Managing your weight with gestational diabetes
Eating a healthy low glycaemic diet and staying active are ways of managing your weight in pregnancy with gestational diabetes, and they also help control your blood sugar levels.
Be aware of the myth of 'eating for two’. Your baby will grow well for the first two trimesters of pregnancy without you eating any extra calories at all. During the last trimester of your pregnancy you may need up to 200 extra calories per day – which is the equivalent to half a sandwich.
The standard way to assess whether someone is overweight, or underweight, is through the body mass index (BMI) using your pre-pregnant or booking-in appointment weight. This is a scale that measures the ratio between your weight and your height. To find out your BMI, use our BMI calculator. Your BMI has to be based on your pre-pregnancy or very early pregnancy weight.
If your BMI is 30 or over you will have extra care in pregnancy as you are at greater risk of some conditions, such as high blood pressure.
"I felt more in control being able to follow the diet. I was a bit stubborn about it, but it did help."
Zoe, mum of one
Read more about managing gestational diabetes with diet here
Read about the value of staying active with gestational diabetes here
How much weight should I put on with gestational diabetes?
Most pregnant women put on some weight in pregnancy, but there is no definitive guidance about how much you should put on as every women is different. The weight includes extra blood volume, the placenta and the growing baby and womb. Do not try to lose weight by ‘dieting’ as this may not be safe for your baby. Your healthcare team will be monitoring you and baby and regularly checking your weight and discussing progress with you.
If your team feels that your weight could be an issue, you may find that they approach this by talking about what to eat, rather than weighing you during your pregnancy. This is because managing your weight when you have gestational diabetes is not about dieting or trying to lose weight.
Read general information about weight and weight management in pregnancy here
How can I manage my weight?
Managing your weight and controlling your blood sugar is about making small changes to your diet and levels of exercise to keep yourself and your baby healthy. If you are cutting back on sugary foods you may find that you lose some weight or stay the same weight instead of putting on weight. So long as it does not happen by cutting out nutritious food groups, this is safe.
Read more here about having a safe and healthy diet with gestational diabetes
What does all this mean for you?
For some women, changing their diet is the hardest thing about having gestational diabetes. Eating our favourite foods can be very comforting, and especially during pregnancy – a time when so much is changing – it can feel very unsettling to have to make yet another change.
It is easy to feel overwhelmed as you start looking at ingredients on packets and realise how much sugar is in the foods we take for granted. But after a while you will find foods that you enjoy even if they are not your old favourites.
"My husband had to change his diet as well as me. We didn’t keep any cakes or sweets in the house!"
Maria, mum of one
Changing your diet also has an effect on your relationship with those around you. Talk to your friends, partner if you have one or family, and decide together how you will do this. Other family members may be happy to join the healthy diet to support you, and to become healthier themselves. Others find a compromise, such as eating separate meals and not keeping sugary foods in the house, to help you avoid temptation. There is no right way, so find what works for you.
- Dornhorst, A and Banerjee, A (2010). Diabetes in Pregnancy, in Holt RIG, Cockram CS, Flyvbjerg A et al (ed.) Textbook of diabetes, 4th edition. Oxford: Wiley-Blackwell
- http://www.nhs.uk/Livewell/loseweight/Pages/BodyMassIndex.aspx
- NICE (2010) Weight management before, during and after pregnancy. National Institute for Health and Clinical Excellence. Public health guidance 27.www.nice.org.uk [pdf file, accessed September 2013]
- Heslehurst D, Brown A (2013) Managing obesity in pregnant women: an online guide for health professionals Available at/baby-loss-support/stories(last accessed 4 August 2014)
- RCOG (2011) Why your weight matters during pregnancy and after birth
Review dates
Last reviewed: 1 March, 2015
Next review: 1 March, 2018
Read more about gestational diabetes
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Testing for gestational diabetes
If you are at risk of developing gestational diabetes, you’ll usually be offered an oral glucose tolerance test (OGTT). -
What are the risks of gestational diabetes?
Gestational diabetes can cause problems in pregnancy, but these risks can be reduced with careful management. -
What is gestational diabetes?
Gestational diabetes is a type of diabetes that can develop during pregnancy. With careful management, most women will have healthy pregnancies and healthy babies. -
Causes of gestational diabetes
We do not understand exactly why some women get gestational diabetes and others don't. But we do know that some factors increase the risk. -
Symptoms of gestational diabetes
Gestational diabetes does not usually cause any symptoms. Most women only find out that they have it when they are tested for the condition. -
Long term implications of gestational diabetes
If you have had gestational diabetes, you can help to reduce your risk of future health issues by maintaining a healthy weight, exercising and eating a balanced diet. -
Gestational diabetes and giving birth
If you have gestational diabetes, your healthcare team should talk to you about your different options for giving birth. -
Understanding the glycaemic index
The glycaemic index is a measure of how quickly sugars are released into the bloodstream. Knowing what foods to avoid helps control gestational diabetes. -
Meal ideas for gestational or type 1 or 2 diabetes in pregnancy
Here are some suggested low glycaemic meal ideas that could help control your blood sugar levels if you have gestational diabetes. -
Injecting insulin
If you’ve been prescribed insulin, you’ll need to give yourself this as an injection. You’ll be given an insulin pen. -
Monitoring your own glucose levels
If you have gestational diabetes, measuring your own blood glucose levels will become something you do regularly. -
Gestational diabetes and premature birth
Diabetes is a condition in which there is an inability to control blood sugar levels and it leads to high amounts of sugar in the blood.