sind zwei bananen am tag zu viel — can a DNA test help?

Whether two bananas a day is too much depends on your overall health, not your DNA. Bananas are nutrient-dense, providing potassium, vitamin B6, and fiber, but also about 25 g of sugar each. For a healthy person without kidney disease or diabetes, two bananas are generally fine. However, no DNA test can reliably tell you if that amount is excessive for you. Despite marketing claims, genetic variants in FTO, MC4R, or carbohydrate metabolism genes have not been shown to predict optimal banana intake in randomized trials (PMID:37813841; PMID:38474735). The effect sizes are small, and professional guidelines advise against using such tests for diet personalization. If you have concerns about potassium (e.g., kidney issues) or blood sugar (e.g., diabetes), a blood test and medical advice are far more useful than a genetic test. In summary: two bananas a day is not too much for most people, and a DNA test cannot meaningfully answer this question. Evidence level: marketing/unclear.