wie lange vor blutabnahme nichts essen — which blood markers matter?

Standard fasting before blood draw is 8–12 hours, water allowed. This mainly affects glucose, triglycerides, LDL cholesterol, and some hormones like insulin. Markers such as HbA1c, cortisol (note diurnal rhythm), or genetic tests do not require fasting. The provided context does not give specific fasting guidance; it only mentions cortisol timing and ACE genetics. Therefore, this answer relies on established medical practice. For MyBody-X tests, always follow the included instructions. Some biomarkers (e.g., postprandial glucose) are intentionally measured after eating. Evidence for fasting recommendations is strong (human-strong), based on numerous clinical studies and guidelines. Caveat: individual variations exist; consult a physician if unsure.