Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Glucomannan, a water-soluble dietary fiber derived from the root of the konjac plant (Amorphophallus konjac), is primarily used to support gastrointestinal health, including the stomach. Scientific evidence supports its benefits in promoting satiety, regulating bowel movements, and possibly aiding in weight management. Several clinical studies have shown that glucomannan can absorb water and expand in the stomach, leading to a feeling of fullness that may help reduce overall calorie intake. This bulking property also helps soften stools and prevent constipation by increasing fecal bulk and promoting regular bowel movements.

The European Food Safety Authority (EFSA) has endorsed glucomannan for its ability to contribute to the maintenance of normal blood cholesterol levels and as an aid to weight loss as part of a calorie-restricted diet. While most research centers on weight management and cholesterol, the mechanism by which glucomannan expands in the stomach and delays gastric emptying underpins its traditional and scientific use for stomach-related benefits, such as appetite control and digestive regulation.

However, evidence for direct effects on the stomach beyond satiety and digestive regularity is limited, and high doses can cause gastrointestinal discomfort or, rarely, obstruction if not taken with sufficient water. In summary, glucomannan's use for supporting the stomach is moderately supported by scientific evidence, particularly in the context of satiety and digestive health.

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