Myths vs facts: Fitness | LifestyleCheck and Fruchtbarkeit

Myths vs facts about Fitness, LifestyleCheck, and Fertility: Many direct-to-consumer tests (e.g., MyBody-X) claim to provide personalized insights into fitness and fertility. However, the scientific basis is often weak. For instance, genetic variants for chronotype (e.g., CLOCK) have small effect sizes, and lifestyle/environment dominate. Similarly, MTHFR variants show limited clinical relevance in well-nourished individuals. Regarding fertility, the provided context lacks direct evidence; extrapolating from fitness markers to fertility is speculative. Bottom line: such tests may offer rough orientation but should not replace medical evaluation. Evidence: mostly marketing/mechanistic. Sources: none specific to fertility in context.