was ist stoffwechsel — what does this mean exactly?

Metabolism (Stoffwechsel) refers to the sum of all biochemical processes that convert nutrients into energy and building blocks. It is divided into catabolism (breaking down molecules for energy) and anabolism (synthesizing cellular components and storage compounds). Basal metabolic rate (BMR) is the energy required at rest for vital functions. Genetic variants (e.g., in FADS2, MTHFR, APOA5) can modulate specific metabolic pathways, but overall metabolism is primarily shaped by diet, physical activity, hormones, and environment. MyBody-X DNA tests can indicate genetic predispositions, but they do not directly measure metabolic rate. A full assessment requires clinical biomarkers such as fasting glucose, lipid panel, and thyroid function. Evidence for individual gene effects is often moderate to weak; clinical relevance should be evaluated by a healthcare professional.