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Why Some High-Fiber Diets Cause Gas -- And What to Do About It

HealthDay News
by -- Robert Preidt
Updated: Feb 5th 2020

new article illustration

WEDNESDAY, Feb. 5, 2020 (HealthDay News) -- If you want to reduce bloating when eating a high-fiber diet, try making it carbohydrate-rich rather than protein-rich, new study findings suggest.

Bloating is a common side effect that discourages many people from adopting a high-fiber diet.

For the study, researchers analyzed data from a clinical trial involving 164 participants who followed heart-healthy, high-fiber diets. The participants were about 40% more likely to report bloating while following diets rich in plant proteins than on carbohydrate-rich regimens.

The findings were recently published online in the journal Clinical and Translational Gastroenterology.

High-fiber diets are believed to cause bloating by increasing certain populations of healthy, fiber-digesting gut bacteria. They produce gas as a byproduct. These findings suggest that carbs and proteins change the gut bacteria population (microbiome).

"It's possible that in this study, the protein-rich version of the diet caused more bloating because it caused more of a healthy shift in the composition of the microbiome," said study co-senior author Noel Mueller. He's an assistant professor of epidemiology at Johns Hopkins Bloomberg School of Public Health, in Baltimore.

"Notably, the protein in these diets was mostly from vegetable sources, such as beans, legumes and nuts," he added.

The findings suggest that substituting high-quality carbs -- such as whole grains -- for proteins might reduce bloating and make high-fiber diets more tolerable.

However, substituting proteins for carbohydrates might make such diets less healthy, the researchers noted in a Hopkins news release.

"Bloating may be just a consequence of a healthy shift in the microbiome, so that if somebody is able to put up with the bloating caused by a high-protein, high-fiber diet, they may ultimately benefit more in other health measures," Mueller said.

More information

The American College of Gastroenterology offers digestive health tips.