was ist epigenetik — which blood markers matter?

Epigenetics refers to heritable changes in gene activity without altering the DNA sequence. Key mechanisms include DNA methylation, histone modifications, and non-coding RNAs. In blood, certain markers can indicate epigenetic processes: DNA methylation of specific genes (e.g., tumor suppressor regions) is used in cancer diagnostics. Additionally, 'epigenetic clocks' (e.g., Horvath clock) estimate biological age from methylation patterns – but these are mostly research tools, not clinically validated. Indirect markers like homocysteine, folate, and vitamin B12 levels reflect methylation capacity but are not direct epigenetic measures. Many direct-to-consumer tests claim to measure 'epigenetic age,' yet evidence for predictive value in healthy individuals is limited. Bottom line: blood markers for epigenetics exist, but interpretation requires expertise and is often not standardized. Be cautious of overblown claims.