The community suggests that there is no strict nutritional ceiling for fiber, with the limit being set primarily by individual digestive tolerance rather than any real physiological danger.

noli's read

Science confirms that there is no established universal Upper Limit, but emphasizes an important distinction between comfort and absorption. Meta-analyses (e.g., Journal of the Academy of Nutrition and Dietetics) validate that fiber promotes metabolic health, but excess can indeed cause gastrointestinal discomfort due to rapid fermentation. It is proven that massive, sudden intakes can reduce the bioavailability of certain minerals like iron or zinc through chelation, a point raised by more cautious members. The argument that our ancestors consumed much higher amounts is observational and plausible, but the modern microbiota differs considerably. The community converges on the idea of gradual adaptation, although there is a debate regarding the real risk of micronutritional deficiencies at very high doses.

the sources

1. 1Reynolds A et al. 2019
2. 2r/nutrition