welche stoffwechseltypen gibt es — what are common causes?

The concept of 'metabolic types' is popular in fitness and nutrition marketing but has limited scientific support. Traditional categories like ectomorph, mesomorph, and endomorph describe body shapes, not distinct metabolic pathways. More recent approaches propose 'carb-type', 'fat-type', or 'mixed-type' based on genetic variants (e.g., PPARA for fat oxidation, ACE for endurance/strength, APOE for lipid metabolism). However, evidence for such rigid typing is weak: most studies show modest associations, not clear-cut categories. Common causes for individual metabolic differences include genetics, hormonal status, gut microbiome, physical activity, and dietary habits. MyBody-X tests can analyze single markers like PPARA or ACE, but inferring a 'metabolic type' from these is an oversimplification and borders on marketing. A proper metabolic assessment should include clinical parameters (fasting glucose, lipid panel, insulin resistance) and medical interpretation. Consumers should be wary of simplistic typing claims that lack robust evidence.