Risks and limits of Ballaststoffe Test

A 'fiber test' (e.g., genetic test for fiber metabolism or microbiome analysis) claims to personalize fiber intake recommendations. However, the scientific evidence is weak. No robust human trials show that following such test results improves health outcomes beyond general dietary guidelines. Known genetic variants (e.g., *FUT2* for gut microbiota composition) have small effect sizes and lack clinical validation. Moreover, fiber is universally beneficial – increasing intake is recommended for everyone regardless of genotype. Risks include false reassurance, unnecessary dietary restrictions, and reliance on unvalidated IgG-based food sensitivity tests, which can lead to nutrient deficiencies. Commercial tests often overstate their predictive power. In summary: the evidence is insufficient to support routine use. Consumers should follow established guidelines (e.g., 25–30 g fiber/day) and consult a healthcare professional for personalized advice, rather than basing decisions on a DNA or IgG test.