When is Ballaststoffe Test actually useful?

A dietary fiber test (e.g., stool test for microbiome markers) is only useful when performed in a clinical context – for example, if a gut disorder or inflammatory bowel disease is suspected. Most direct-to-consumer (DTC) fiber tests lack sufficient validation. They often measure crude markers like pH or short-chain fatty acids, whose individual interpretability is limited. The German Nutrition Society (DGE) recommends a daily fiber intake of 30 g, regardless of test results. A test may provide rough orientation but does not replace medical advice. Evidence: marketing/unclear. Caveat: No clinical approval as a diagnostic tool.