What to watch with FTO and blood sugar?

The FTO gene (e.g., variant rs9939609) is strongly associated with obesity and type 2 diabetes via GWAS. Its effect on blood sugar is largely indirect through BMI: risk allele carriers tend to have higher BMI, promoting insulin resistance. Direct, BMI-independent effects on glucose regulation are debated. The variant rs1800206 mentioned in context is linked to body height, not blood sugar. Consumer DNA tests like MyBody-X may report FTO variants, but effect sizes are small and clinical predictive value is limited. Lifestyle interventions (exercise, diet) can significantly mitigate risk. Note: DNA testing does not replace medical blood glucose monitoring. Evidence: GWAS-based, moderate translatability.