How are FTO and Müdigkeit related?

The relationship between FTO variants and fatigue is not well established. FTO is primarily associated with obesity risk and appetite regulation via its role in energy homeostasis. Some research suggests indirect links through altered energy metabolism or sleep patterns, but effect sizes are small and findings inconsistent. Fatigue is multifactorial—sleep quality, stress, nutrition, and physical activity are far more influential than a single SNP. Consumer DNA tests often overstate such connections. Evidence: mechanistic/unclear. Caveat: No diagnostic value.