Is MY FOODBOOK useful for longevity?

Whether MY FOODBOOK is useful for longevity cannot be strongly affirmed based on available evidence. MY FOODBOOK appears to be a personalized nutrition book derived from DNA testing, similar to MyBody-X's DNA Ernährungstest. However, the evidence for such tests is mostly observational or marketing-driven. Studies indicate that single gene variants (e.g., FADS2, PPARA) have small effects on fat metabolism, but dietary impact on longevity is multifactorial: lifestyle, exercise, sleep, stress, and social factors matter more. No genetic test or diet book can guarantee or predict longevity. Moreover, many such tests are not validated for children and may cause unnecessary anxiety or restrictive diets if misinterpreted. For an evidence-based longevity strategy, regular physical activity, a balanced diet rich in vegetables, whole grains, and healthy fats, along with medical check-ups, are more important than any single personalized book. MY FOODBOOK may serve as supplementary inspiration but should not be the sole basis for longevity decisions. The evidence level is 'marketing/unclear'.