![]() ![]() ![]() Participants are from the Optimal Macronutrient Intake Trial to Prevent Heart Disease (OmniHeart), a randomized 3-period crossover feeding trial. We also evaluated whether the effects differed by race, sex, age, and obese status. We hypothesized that, consistent with our previous work ( 7), all 3 high-fiber diets increase the risk of bloating, but the effect is modified by the type of macronutrient. These diets were identical in calories but had different macronutrient compositions (one high in carbohydrate, another high in protein, and a third high in unsaturated fat). In this study, we examined the effects of 3 modified versions of the DASH diet, all high in fiber, on bloating. To our knowledge, no trial has tested the effects of macronutrient composition on the symptom of bloating in the context of high fiber intake. Alternatively, other aspects of diet, e.g., the macronutrient composition of the diet (carbohydrate, protein, and fat), might affect the occurrence and/or severity of bloating. These discrepant findings may be due to the differential effects of fiber supplementation vs fiber from food. ( 8) found that supplementation with a high-fiber cereal reduced bloating in a randomized trial. We recently found in the Dietary Approaches to Stop Hypertension (DASH)-Sodium Trial that the DASH diet-a healthy dietary plan rich in fruits, vegetables, low-fat dairy food, and fiber-may increase the risk of bloating ( 7). In addition, dietary fiber in food may impair gas transition and promote gas retention ( 6).įew population studies have examined the effects of dietary fiber on bloating. Bacteria in the colon produce gas by breaking down and fermenting incompletely digested food (e.g., fibers) ( 5). Bloating is also the hallmark symptom of irritable bowel syndrome (IBS) ( 3), a highly prevalent condition in the United States ( 4). Bloating, a sensation of increased abdominal pressure ( 1), is one of the most common gastrointestinal (GI) symptoms in the United States, with 1 in 5 people reporting having had the symptom in the past week ( 2). ![]()
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