About 30% of Americans have insomnia, and a new study finds carb-heavy diets may share part of the blame.

A study looked at diet-linked fluctuations in blood sugar, said lead author James Gangwisch. He is assistant professor of clinical psychiatric social work at Columbia University in New York City.

“Highly refined sugars” — added sugars, sodas, white rice, refined wheat flour — have what’s known as a high glycemic index, which can trigger a sudden rise in blood sugar.

“When blood sugar is raised quickly, your body reacts by releasing insulin, and the resulting drop in blood sugar can lead to the release of hormones such as adrenaline and cortisol, which can interfere with sleep,” Gangwisch explained in a university news release.

The new study focused on more than 50,000 older women who completed food “diaries” as part of the ongoing Women’s Health Initiative study.

The study couldn’t prove a cause-and-effect relationship, but Gangwisch’s team found that postmenopausal women who ate a lot of refined carbohydrates, especially added sugars, were likely to become insomniacs.

The higher the woman’s dietary glycemic index, which measures the amount of sugar in foods, the higher her risk for insomnia, according to the study. That was particularly true when diets included added sugars and processed grains, the study authors said.

On the other hand, a diet rich in vegetables, fiber and whole fruit was tied to fewer problems with insomnia, and better, restful sleep, the findings showed.

Whole fruits contain sugar, but the fiber in them prevents spikes in blood sugar, Gangwisch explained. “This suggests that the dietary culprit triggering the women’s insomnia was the highly processed foods that contain larger amounts of refined sugars that aren’t found naturally in food,” he said.

While the study focused on older women, these findings probably apply to men and people in all age groups, the researchers believe.

Two experts in diabetes and blood sugar control said the findings aren’t surprising.

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