Subscribe to the BioNews newsletter for free

Advanced Search

Search for

Like the Progress Educational Trust on Facebook

The Fertility Show, Manchester Central, 24-25 March 2018


High-fibre diets may affect fertility

08 February 2010

By Dr Will Fletcher

Appeared in BioNews 544

Women who eat too much fibre may ovulate less and have lower oestrogen levels, according to a recent study. The researchers examined the link between fibre consumption and hormone concentrations in 250 women aged 18 to 44 and found that those who reported eating the recommended 20g to 35g of fibre a day had the lowest blood concentrations of oestrogen and other reproductive hormones. A roughly 10-times higher risk of having 'anovulatory' menstrual cycles (where the ovaries fail to release an egg) was also linked to high fibre intake, especially fibre from fruit.

The researchers, led by Audrey Gaskins from the National Institute of Child Health and Human Development (NICHD), Rockville, Maryland, US, published their findings in the American Journal of Clinical Nutrition, making sure to point out that their results do not mean that high-fibre diets are a bad thing - after all, they have been linked to many health benefits such as lower risks of diabetes, heart disease, breast cancer and colon cancer. However, the team do believe their findings 'call into question' whether the current regulations are best for those women who are trying to become pregnant.

All of the 250 women in this study were healthy, and having regular menstrual periods. But the women who reported the highest fibre intake (22g a day or more) were found to be more likely to have at least one anovulatory cycle over two months, as measured by the low levels of oestrogen and other reproductive hormones in their blood over two menstrual periods. Some 22 per cent of menstrual cycles in this high-fibre group were anovulatory as opposed to only seven per cent in the low-fibre group.

However, there are many causes for anovulation, including extreme anxiety or stress, having too little or too much body fat, taking too much exercise, thyroid gland dysfunction and polycystic ovarian syndrome - a common female endocrine disorder that affects approximately five per cent to ten per cent of women of reproductive age. It was only once the researchers took into account these factors, along with others such as race and calorie intake, that they arrived at the corrected estimate of high fibre intake causing a roughly ten-times higher risk of anovulation.

Ms Gaskins emphasised that, while the results were consistent with fibre disrupting some women's ovulation, they did not prove that this was the case. However, there is a biologically plausible mechanism that could explain the findings. Quite simply, high-fibre diets are known to decrease the activity of particular intestinal enzymes, in turn causing more oestrogen to be excreted from the body in faeces because less oestrogen is being reabsorbed in the colon. Whilst more studies are needed before any solid conclusions can be drawn and recommendations made, Ms Gaskins and her team believe that their results suggest that women who are trying to conceive may benefit from lowering their fibre intake.

American Journal of Clinical Nutrition | 19 August 2009
Daily Mail | 02 February 2010
Fox News | 04 November 2009


05 December 2011 - by Dr Caroline Hirst 
Women receiving fertility treatment are more likely to become pregnant if they take multivitamin supplements, reports a UK pilot study...
26 April 2010 - by Kyrillos Georgiadis 
Expectant mothers' lifestyles and environment could have a 'major impact' on their sons' sperm counts, a study has found...

06 November 2007 - by Katy Sinclair 
A study by the Harvard School of Public Health (HSPH) has found that women have a reduced risk of infertility due to ovulatory disorders if they adopt a combination of healthy lifestyle and dietary measures. The study, published in Obstetrics and Gynecology, was based on 17,544 women...

Be the first to have your say.

You need to or  to add comments.

By posting a comment you agree to abide by the BioNews terms and conditions

- click here to enquire about using this story.

Published by the Progress Educational Trust
Advertise your products and services HERE - click for further details

Good Fundraising Code

Become a Friend of PET HERE and give the Progress Educational Trust a regular donation