Hello!

September 15, 2025

7 Comment

One of the first things we’re told as expecting mums is just how important folic acid is in pregnancy, to helps protect babies from neural tube defects like spina bifida. But new research out of South Australia suggests that too much might not be such a good thing either.

A study from Flinders University and the University of Adelaide has found a link between high folic acid intake and a greater risk of gestational diabetes. And with rates of gestational diabetes in Australia more than tripling over the past decade, it’s raising some big questions about current supplement guidelines.

Researchers say the problem comes from a double dose effect. Folic acid is added to many foods as part of national fortification programs, and on top of that, many pregnant women are taking higher-than-recommended supplements.

Dr Tanja Jankovic-Karasoulos, who led the study of more than 2000 women, said their findings show that, “excess maternal folate significantly increases gestational diabetes risk” in today’s pregnancy population. She suspects that rising folic acid intake over the past 10–15 years could be part of the reason gestational diabetes is becoming so common.

“Our study suggests that higher-than-recommended FA intake may have unintended consequences for pregnancy,” she explained.

“The placenta is central to regulating maternal glucose tolerance in pregnancy, so we need to understand how high FA intake affects placental function and, in turn, insulin resistance and gestational diabetes risk.”

The researchers say the findings highlight an urgent need to establish a safe upper limit for folic acid intake during pregnancy, as well as improve guidelines on folic acid supplementation during pregnancy.

  • When I had my first baby I went under a specialist and I now see that he was very much ahead of his time. He refused to give me anything unless i needed it. he felt that taking extra vitamins and such could be a negative if you didnt need them, He did fortnightly blood tests and I went my entire pregnancy without taking Iron or extra vitamins.

    Reply

  • This is so interesting. It’s good that this information is coming to light.

    Reply

  • That is really interesting! Especially considering we are encouraged to take supplements to increase our folic acid and even to eat different foods that contain it. I always associated gestational diabetes more with women who did not have a healthy enough diet during pregnancy (and normally) and that being the body’s response…

    Reply

  • This shocked me a little , I’m used to being told excessively to take folic acid before even trying for a baby!

    No one ever mentioned a limit to me or that it could be so dangerous to take too much! I will definitly keep this in my mind when we try for our next child

    Reply

  • It is good that this is being researched and reviewed on a regularly basis as medical knowledge and insight continues to improve. With Folic acid being added to many foods and than also taking supplements I think it will become the question for many how high their intake actually is. Those who are pregnant should be made aware and advised about this by health professionals

    Reply

  • Wow. You hear so much about the importance of folic acid that I bet quite a few women are deliberately taking a higher than recommended dose – this is the first time I’ve heard anything bad about that. It’s an important reminder, though, that dosages are important for a wide range of things.

    Reply

  • That’s definitely an interesting finding! Whilst i dont know too much about gestational diabetes, i know it’s never fun to have when pregnant, and having to be extra cautious about your diet and what you are consuming. Folic acid is never one i thought that could contribute to that, very interesting!

    Reply

Post a comment

To post a review/comment please join us or login so we can allocate your points.

↥ Back to top

Thanks For Your Star Rating!

Would you like to add a written rating or just a star rating?

Write A Rating Just A Star Rating
Join