What do studies say about Schlaf Ernährung?

Scientific evidence on sleep and nutrition reveals a bidirectional relationship: sleep deprivation alters hunger hormones (increases ghrelin, decreases leptin) and can lead to higher caloric intake and impaired glucose regulation. Conversely, diet composition affects sleep quality – for example, tryptophan-rich foods or caffeine timing. The genetic tests mentioned in the context (e.g., for chronotype or CYP1A2 caffeine metabolism) have weak predictive power. Most associations come from GWAS with small effect sizes and are not validated for individual dietary or sleep recommendations. Direct-to-consumer tests often overstate clinical relevance. An evidence-based approach remains: consistent sleep schedules, balanced diet, and avoiding caffeine in the evening – regardless of genotype. The evidence for personalized sleep-nutrition interventions based on DNA tests is currently unclear to mechanistic.