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Strawberries could mitigate colonic inflammation

Strawberries could mitigate colonic inflammation

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Inflammatory bowel disease (IBD) is a set of painful conditions that can cause severe diarrhea and fatigue. Treatments can include medications and surgery. But now researchers report that a simple dietary intervention could mitigate colonic inflammation and improve gut health. In this case, a strawberry -; or rather, less than a cupful of strawberries -; a day could help keep the doctor away.

The researchers are presenting their results today at the 256th National Meeting & Exposition of the American Chemical Society (ACS). ACS, the world’s largest scientific society, is holding the meeting here through Thursday. It features more than 10,000 presentations on a wide range of science topics.

“The sedentary lifestyle and dietary habits of many people in this country -; high-sugar, high-animal-fat, but low-fiber diets -; may promote colonic inflammation and increase the risk of IBD,” says Hang Xiao, Ph.D., who led the study.

In 2015, 3 million adults in the U.S. reported being diagnosed with IBD, according to the U.S. Centers for Disease Control and Prevention. IBD includes both Crohn’s disease, which can infect any part of the gastrointestinal tract, and ulcerative colitis, which is characterized by inflammation of the colon and rectum. People with IBD also have a higher risk of colorectal cancer.

The dietary consumption of fruits and vegetables has been associated with a lowered risk of IBD. To establish an effective and practical approach to decrease colonic inflammation in both IBD patients and the general population, Xiao and his team at the University of Massachusetts Amherst focused on strawberries due to their wide consumption. According to Yanhui Han, a Ph.D. student who conducted the study, most of the previous reports focused on the effects of purified compounds and extracts from strawberries. “But when you only test the purified compounds and extracts, you miss out on a lot of other important components in the berries, such as dietary fiber, as well as phenolic compounds bound to the fibers, that can’t be extracted by solvents,” he says. He adds that it also makes sense to study the effects of whole berries because people mostly consume the whole fruits rather than their extracts.

In their experiment, Han and Xiao used four groups of mice -; a group of healthy mice consuming a regular diet, and three groups of mice with IBD consuming a regular diet, a diet with 2.5 percent whole strawberry powder or a diet with 5 percent whole strawberry powder. Xiao says they tried to feed the mice doses of strawberries that would be in line with what a human could reasonably consume.

The researchers found that dietary consumption of whole strawberries at a dose equivalent to as low as three-quarters of a cup of strawberries per day in humans significantly suppressed symptoms like body weight loss and bloody diarrhea in mice with IBD. Strawberry treatments also diminished inflammatory responses in the mice’s colonic tissue.

But decreased inflammation wasn’t the strawberry’s only conferred benefit during this study. Colonic inflammation adversely impacts the composition of microbiota in the gut. With IBD, the abundance of harmful bacteria increases, while levels of beneficial bacteria decrease in the colon. Following the dietary treatments of whole strawberries, the researchers observed a reversal of that unhealthy microbiota composition in the IBD mice. Xiao’s team also obtained experimental data that indicated strawberries might impact abnormal metabolic pathways in the IBD mice, which in turn could lead to the decreased colonic inflammation they observed.

Next, the team will try to validate their findings in IBD patients. While eating three-quarters of a cup of strawberries a day could be beneficial for those looking to enhance their gut health, Xiao advises patients to consult with their doctors before changing their diets. He also suggests avoiding this type of nutritional intervention if one is allergic to the fruit.

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