Evidence supporting the use of: Konjac
For the health condition: Appetite (excessive)

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Synopsis

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

Konjac (Amorphophallus konjac) is a plant whose root is used to produce glucomannan, a soluble dietary fiber. Scientific evidence suggests that glucomannan can help reduce appetite, primarily by promoting a sense of fullness. When consumed, glucomannan absorbs water and expands in the stomach, which can delay gastric emptying and increase feelings of satiety. Several randomized controlled trials and meta-analyses have investigated its effects on weight loss and appetite regulation. For example, a 2014 systematic review in the Journal of Obesity found that glucomannan supplementation led to modest but significant reductions in body weight in overweight and obese individuals, likely due to decreased food intake. However, the overall quality of evidence is moderate, with some studies showing no effect, and most trials are of short duration. Safety concerns are minimal, though rare cases of esophageal or gastrointestinal obstruction have been reported when tablets or insufficient water is consumed. While traditional Asian medicine uses konjac as a food and for digestive health, its application for appetite control is grounded more in recent scientific research than in historic use. In summary, scientific studies provide moderate evidence that konjac (glucomannan) can support appetite regulation, but effects are generally modest, and further long-term research is needed.

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