was ist ein genetischer ernährungstest — what does this mean exactly?

A genetic nutrition test analyzes selected DNA variants linked to metabolism, nutrient processing, or food sensitivities. However, the scientific basis is often weak: many associations come from GWAS with small effect sizes (e.g., rs5400 for glucose, TCF7L2 for diabetes risk) or mechanistic studies (e.g., IL6 as an inflammation marker). Such tests cannot provide clinically validated dietary recommendations – they offer at best hints that must be supplemented by blood markers (HbA1c, glucose) or symptoms. Critically, a genetic test does not replace IgE testing for food allergies. The evidence is mixed: for some markers (e.g., ALDH2 rs671) population data exist, but clinical validity for dietary decisions is often lacking. Bottom line: A genetic nutrition test is a screening tool with limited predictive power – not a personalized diet based on a single gene.