Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Dietary fiber is primarily recognized for its benefits in digestive health, particularly in promoting regular bowel movements and preventing constipation. There is also some scientific evidence suggesting that fiber can play a role in supporting the management of acid indigestion (also known as dyspepsia or heartburn). Several observational studies have found that higher fiber intakes are associated with a lower risk of gastroesophageal reflux disease (GERD), a primary cause of acid indigestion. The proposed mechanisms include fiber’s ability to absorb gastric acid, increase gastric emptying, and reduce transient lower esophageal sphincter relaxations, which are a major contributor to acid reflux symptoms. For example, a 2004 study published in "Gut" found that a high-fiber diet reduced the risk of reflux symptoms. However, the quality and quantity of evidence are limited, with few randomized controlled trials specifically examining fiber supplementation as a treatment for acute acid indigestion. Additionally, some forms of fiber (especially insoluble fiber) can aggravate symptoms in certain individuals with functional gastrointestinal disorders. Thus, while there is scientific rationale and some supporting data, fiber is not a primary or universally effective treatment for acid indigestion, and the evidence does not reach the highest level of clinical validation. More research, particularly intervention studies, is needed to clarify fiber’s role in managing acid indigestion.

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