Myths vs facts: MY FOODBOOK and Sport

Myth: MY FOODBOOK can tell you exactly which foods to eat to optimize your sports performance based on your DNA. Fact: While some genetic variants (like those in ACTN3, ACE, or PPARGC1A) have been associated with athletic performance or nutrient metabolism, the evidence is often from small studies or GWAS with modest effect sizes. Direct-to-consumer tests like MY FOODBOOK may report these variants, but they do not account for the complex interplay of training, diet, environment, and other genes. The effect of a single SNP on sports nutrition is usually small and not clinically actionable without considering overall lifestyle. Myth: MY FOODBOOK results are as reliable as a blood test. Fact: DNA tests are generally accurate for genotyping, but the interpretation of how that genotype affects sports performance is based on population averages, not individual prediction. Many reported associations have not been replicated in large trials. Myth: You can replace a sports dietitian with MY FOODBOOK. Fact: Personalized nutrition from DNA tests can be a conversation starter, but it is not a substitute for professional guidance. The best approach is to use such tests as one piece of a broader assessment that includes blood biomarkers, training logs, and dietary habits. Safety note: Do not make drastic dietary changes based solely on DNA results; consult a professional.