warum vertrage ich plötzlich keinen kaffee mehr — what symptoms are typical?

Sudden coffee intolerance can stem from many non-genetic factors. Typical symptoms include jitters, palpitations, heartburn, nausea, diarrhea, insomnia, or heightened anxiety. Possible triggers: changes in caffeine metabolism (due to medications, hormonal shifts, liver function), irritable bowel, or increased sensitivity from stress. A DNA test for caffeine metabolism (CYP1A2) may offer clues but cannot explain a sudden change—genotype is stable. MyBody-X tests are not diagnostic. If symptoms persist, consult a doctor, reduce coffee, or try decaf. Evidence: practice-based; no strong genetic link for acute intolerance.