Myths vs facts: FTO and Abnehmen

The myth: An FTO gene test can tell you whether a low-carb or low-fat diet is best for weight loss. The facts: Randomized controlled trials (RCTs) show no meaningful difference in weight loss between these diets based on FTO genotype. The FTO gene does have a small effect on body weight (typically <1 kg), but it does not predict which diet type will work better for an individual. Direct-to-consumer (DTC) nutrigenetic tests often overstate this link, leading to false expectations. Major health organizations (AHA, ACMG) caution against using such tests for diet decisions. Personal adherence, lifestyle, and overall dietary quality are far more important. In short, FTO testing for diet personalization is not supported by strong evidence. Consumers should be skeptical of claims that a DNA test can prescribe a specific weight-loss diet.