What to watch with Fitness Vitality DNA and longevity?

When looking at a Fitness Vitality DNA test for longevity, be aware of several limitations. Most DNA variants (e.g., rs17782313 near MCRE, TCF7L2) have small effect sizes on BMI or diabetes risk – they are not deterministic. Lifestyle factors (diet, exercise, sleep, stress) overwhelmingly determine healthspan. Evidence for many 'longevity' markers is often mechanistic or from GWAS, not from interventional trials. Many commercial tests lack validation for the general population and can mislead if presented as medical diagnoses. A cortisol home test (e.g., from MyBody-X) can complement by showing stress recovery, but a single measurement is unreliable. Bottom line: Use DNA results as inspiration, not destiny. Combine with blood biomarkers (HbA1c, lipids) and real behavior changes. The science is still evolving – stay skeptical of overblown claims.