What to watch with MY FOODBOOK and skin aging?

When using MY FOODBOOK (or similar personalized nutrition tests) in relation to skin aging, caution is warranted. The available evidence is mixed: while certain genetic variants like FUT2 (rs602662) can influence vitamin B12 absorption, which may theoretically affect skin health, direct studies linking such markers to skin aging are lacking. The interaction of APOE genotypes with omega-3 fatty acids has not been specifically studied for skin aging. Stool test reproducibility is limited, and epigenetic clocks (e.g., GrimAge) are validated at group level, not for individual skin aging. MY FOODBOOK can serve as a general guide but should not be considered a medical diagnostic tool. Recommendation: critically evaluate results, rely on proven skin care (sun protection, antioxidants), and consult a dermatologist for specific concerns.