Lowering your risk of gestational diabetes – here is what you need to know

Posted in Pregnancy Health.

Many expectant mums won’t find out if they have developed gestational diabetes until they are at least 24 weeks into their pregnancy. But there are plenty of things mums-to-be can do to help lower their risk of developing it early on.

We speak to the experts to find out why nutrition in pregnancy is so important.

What is gestational diabetes?

Gestational diabetes is a form of diabetes that occurs during pregnancy and affects about 12 to 14 per cent of pregnant Australian women.

National Diabetes Services Scheme and diabetes in pregnancy priority area leader Melinda Morrison tells Babyology that during pregnancy some of the hormones produced by the placenta to help baby grow and develop also reduce the action of the mother’s insulin.

“Insulin is the hormone that allows glucose from the bloodstream to enter the body cells and be used for energy,” Melinda says. “This means that during pregnancy, women need to make two to three times as much insulin to keep blood glucose levels in the normal range. If the body isn’t able to produce the extra insulin needed, blood glucose levels rise and gestational diabetes develops.”

While gestational diabetes usually goes away after baby is born, women who develop gestational diabetes are at a higher risk of developing type 2 diabetes in the future. Diabetes Australia also explains it is becoming more common in Australia and now affects thousands of pregnant women.

Who is at risk of developing gestational diabetes?

There are many reasons why some women develop gestational diabetes but Diabetes Australia says those with a higher risk include women who:

  • Are aged 25 or older
  • Have a family history of type 2 diabetes or gestational diabetes
  • Have had gestational diabetes during previous pregnancies
  • Are overweight
  • Have previously had polycystic ovary syndrome
  • Have previously given birth to a large baby
  • Are from an Indigenous Australian or Torres Strait Islander background
  • Are from a Vietnamese, Chinese, Middle Eastern, Polynesian or Melanesian background

How to reduce the risk of developing gestational diabetes

While research has provided some evidence to show that a healthy lifestyle before pregnancy can help to reduce a woman’s risk of gestational diabetes, some women who eat well, exercise and have great overall health can develop gestational diabetes when the changing pregnancy hormones make the body more resistant to insulin.

“We also know that some of the risk factors for gestational diabetes are things you can’t change such as age of family history,” Melinda says. “So focusing on the things you can change such as healthy eating, regular physical activity and aiming to be a healthy weight before pregnancy are some of the things that women can do to reduce their risk.”

Aiming for a healthy weight

Melinda says aiming for a healthy weight, or as close as possible to your healthy weight range, before pregnancy can help reduce the risk of gestational diabetes. She recommends women speak to an accredited practising dietitian for individual advice.

“There is also evidence suggesting that the amount of weight gained during pregnancy is important,” Melinda says. “So it’s recommended that women discuss individual weight gain targets for pregnancy with their health professionals. The amount of weight gain recommended during pregnancy will depend on your weight at the start of pregnancy.”

Positive steps forward

Melbourne dietician Melanie McGrice shares with Babyology some other positive steps women can take to help reduce their risk. Here’s her top tips for lowering your risk of developing gestational diabetes by maintaining a nutritious diet and lifestyle.

Healthy diet

This means having a diet that includes all the core food groups while keeping in mind food safety in pregnancy.

Small regular meals

Having small regular meals throughout the day, as opposed to two or three large meals, will keep blood glucose levels steady and avoid spikes.

Choose low-GI carbohydrates

Start by avoiding sugar and sugary foods such as lollies and soft drinks and steer away from pastas.

Dairy is a great low GI option and for other favourite foods, try swapping for lower GI options such as:

  • Using wholegrain bread instead of white
  • Eating fruit rather than drinking juice
  • Having sweet potato instead of potatoes or leaving skin on to lower the GI

Regular physical activity

Melanie says she can understand why some women avoid exercise during pregnancy but says it is so important they realise how beneficial it can be. “A lot of women I see are hesitant to exercise during pregnancy, particularly if they have been through IVF, because they are so scared to do anything in case of miscarriage,” Melanie says. 

“I totally understand that thinking but the research doesn’t support that. There are so many health benefits of exercising throughout pregnancy, it actually reduces the risk of miscarriage and reduces the risk of gestational diabetes. Unless you have a particular medical condition such as pelvic instability, you shouldn’t avoid exercise during pregnancy.”


Melanie says research shows getting less than seven hours sleep a night puts anyone at a higher risk of gaining weight. “The research shows quite clearly women getting less than seven hours sleep are likely to gain weight because of the impact to their appetite hormones and a whole range of other factors. And pregnancy is quite commonly a period where many women experience a lack of sleep.”

Melanie adds that women need to take time to get the proper rest they need and make their health a priority. “Many of my clients who are pregnant are women trying to do it all – maintain a normal life, which often means working full-time, running a household and maintaining an active social life on top of pregnancy.

“While we shouldn’t have to wrap ourselves in cotton wool, I do think when we are pregnant we have to put our health first. We need to make our health a priority so allowing time for meal preparation, exercise and sleep.”

What if I am diagnosed with gestational diabetes?

If you have been diagnosed with gestational diabetes, Melanie says it is crucial you get expert guidance. “It is really important, if you are diagnosed with gestational diabetes, to see a diabetes educator and an accredited practicing dietician because it is very important to measure your blood glucose levels on a regular basis, which is usually a couple of times a day.” 

“A diabetes educator or endocrinologist will guide you on how to monitor your blood glucose levels and a dietician will help come up with a diet to get you readings under a recommended level. There is usually a tight range for women who are pregnant and so, if they are not able to meet that range, we usually put them on insulin injections right away because having high blood glucose levels during pregnancy can impact your baby.”



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