What to watch with Fitness Vitality DNA and fertility?

Combining a CGM (continuous glucose monitor) with a DNA test like 'Fitness Vitality' for carb optimization is appealing but lacks strong evidence. CGM provides real-time glucose data, helping you identify personal responses to carbs – that's practice-based and useful. The DNA test, however, analyzes variants like FTO or TCF7L2 with tiny effect sizes (GWAS, beta <0.1) and cannot reliably predict optimal carb intake. Claims of personalized diet plans from DNA are largely marketing, not clinically validated. CGM can guide your eating by showing actual glucose spikes, while the DNA test offers only weak, probabilistic hints. Caveat: neither tool diagnoses diabetes or replaces medical advice. For fertility, some DNA markers (e.g., MTHFR) have been studied, but again effects are small. Use CGM for actionable insights; treat DNA results as curiosity, not prescription.