Pre-Pregnancy Potatoes and Gestational Diabetes

Pre-Pregnancy Potatoes and Gestational Diabetes

Five cups of spuds weekly boosts odds by 50 percent, research suggests

WebMD News from HealthDay

By Dennis Thompson

HealthDay Reporter

TUESDAY, Jan. 12, 2016 (HealthDay News) — Women who eat lots of potatoes before pregnancy appear more likely to develop gestational diabetes, a new study suggests.

A woman's risk of gestational diabetes seemed to increase by 27 percent if she regularly consumed between two and four cups of potatoes a week before pregnancy. Five or more cups a week appeared to increase risk by 50 percent, even after researchers accounted for pre-pregnancy obesity and other potential risk factors, the study found.

"The more women consumed potatoes, the greater risk they had for gestational diabetes," said senior author Dr. Cuilin Zhang, a senior investigator with the U.S. National Institute of Child Health and Human Development. "Potatoes are regarded as a kind of vegetable, but not all vegetables are healthy."

However, it's important to note that this study only showed an association between potato consumption and the risk of gestational diabetes — a type of diabetes that develops during pregnancy. The study wasn't designed to prove cause-and-effect.

Findings from the study were released online Jan. 12 in the BMJ.

Potatoes are the third most commonly consumed food crop in the world, after rice and wheat. About 35 percent of U.S. women in their childbearing years eat potatoes daily, according to background information in the study.

Potatoes are rich in vitamin C, potassium and fiber. Unfortunately, potatoes also contain a significant amount of simple carbohydrates, which are easily broken down and absorbed into the bloodstream, Zhang said.

Eating a cup of potatoes can send blood sugar levels skyrocketing, on par with swigging a can of cola or munching a handful of jelly beans, according to Harvard nutrition experts.

Elevated blood sugar levels can promote insulin resistance and contribute to the development of type 2 diabetes, Zhang said.

Many women also eat potatoes prepared as French fries, and the oils used for frying can increase insulin resistance when consumed, she added.

To investigate the effect of potato consumption on pregnancy, Zhang and her colleagues gathered data from nearly 16,000 women participating in a national health study of female nurses.

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