Risks and limits of Ballaststoffe Alltag

Dietary fiber (soluble and insoluble) is crucial for digestive health, but excessive or rapid intake can cause side effects. Common risks include bloating, gas, and abdominal discomfort, as the gut microbiota needs time to adapt. A sudden increase in fiber—e.g., switching to whole grains or raw vegetables—can paradoxically lead to constipation if fluid intake is insufficient. Very high doses (above 50–60 g/day) may impair absorption of minerals like calcium, iron, zinc, and magnesium by binding them in the gut. Individuals with sensitive bowels (e.g., irritable bowel syndrome) often tolerate certain sources like wheat bran or legumes poorly. Caution is also advised in cases of diverticulitis or intestinal strictures. The evidence for fiber’s health benefits (cardiovascular, glycemic control, colorectal cancer prevention) is strong, while the risks are generally mild and manageable through gradual increase, adequate hydration, and personal tolerance. In everyday life, a balanced fiber intake—around 25–30 g/day for adults—is safe and recommended for most people.