Eating fast food causes delay in conception – Study

A new study has revealed that women who eat less fruit and more fast food take longer to get pregnant and are less likely to conceive within a year.

Prof Claire Roberts, Lloyd Cox Professorial Research Fellow, from the University of Adelaide’s Robinson Research Institute who led the study said, the findings show that eating a good quality diet that includes fruit and minimising fast food consumption improves fertility and reduces the time it takes to get pregnant.

“Compared to women who ate fruit three or more times a day in the month before conception, women who ate fruit less than one to three times a month took half a month longer to become pregnant. 

“Similarly, compared to women who never or rarely ate fast food, women who consumed fast food four or more times a week took nearly a month longer to become pregnant,” said Prof Roberts.

Among all the couples in the study, 468 (8%) couples were classified as infertile (defined as taking longer than a year to conceive) and 2204 (39%) conceived within a month. When the researchers looked at the impact of diet on infertility, they found that in women with the lowest intake of fruit, the risk of infertility increased from 8% to 12%, and in those who ate fast food four or more times a week, the risk of infertility increased from 8% to 16%.

First author Dr Jessica Grieger, post-doctoral research fellow at the University of Adelaide, said: “We recommend that women who want to become pregnant should align their dietary intakes towards national dietary recommendations for pregnancy. Our data shows that frequent consumption of fast foods delays time to pregnancy.”

Previous research has tended to focus on the role that diet plays in women diagnosed with or receiving treatment for infertility; the impact of maternal diet before conception in the general population has not been widely studied. 

This research was carried out in women recruited to the multi-centre Screening for Pregnancy Endpoints (SCOPE) study between 2004 and 2011. Of the 5,598 women, the majority (5258, 94%) received no fertility treatments before conception and 340 did.

During the first antenatal visit at around 14-16 weeks’ gestation, midwives collected information about the time it took to become pregnant and the women’s diet. This included details of their diet in the month before conception, and how frequently they consumed fruit, green leafy vegetables, fish and fast foods. Fast foods included burgers, pizza, fried chicken and chips that were bought from take-away or fast food outlets. 

Fast foods eaten at home (bought from supermarkets, for example) were not included in the data collected and so consumption of this type of food is likely to be under-reported. 

Dr Grieger said: “Most of the women did not have a history of infertility adding that they adjusted the relationships with pre-pregnancy diet to take account of several factors known to increase the risk of infertility, including elevated body mass index [BMI] and maternal age, smoking and alcohol intake. 

“As diet is a modifiable factor, our findings underscore the importance of considering preconception diet to support timely conception for women planning pregnancy.”

The researchers also found that while intake of fruit and fast foods affected time to pregnancy, pre-pregnancy intake of green leafy vegetables or fish did not.

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