warum vertrage ich plötzlich keinen kaffee mehr — can a DNA test help?

Sudden coffee intolerance can have many causes: hormonal shifts, medications, gastrointestinal issues, or stress. A DNA test can provide clues about your caffeine metabolism (e.g., CYP1A2 variants), but it cannot explain an acute intolerance. The evidence for genetic prediction is moderate, but not for sudden onset symptoms. Better to see a doctor to rule out reflux, gastritis, or food sensitivities. A microbiome test might offer additional hints about gut health, but it is not a diagnosis. DNA tests are often misleading here because they reflect lifelong patterns, not acute changes.