sind bananen ballaststoffreich — can a DNA test help?

Bananas are indeed a source of dietary fiber, particularly pectin and resistant starch (in unripe bananas). However, a DNA test cannot tell you whether bananas are high in fiber – that is a basic nutritional fact. DNA-based diet tests (nutrigenetics) examine variants in genes like FTO or TAS2R38, which may influence appetite or taste preferences, but they do not measure the fiber content of a food. The evidence for such tests is often weak: many associations are not replicated or have very small effect sizes. A test might theoretically indicate sensitivity to certain fibers (e.g., in IBS), but that is not a standard claim. In practice, most commercial DNA tests for nutrition are more marketing than science. If you want to know if bananas are high in fiber, check the nutrition label (about 2–3 g per 100 g). A DNA test cannot help here – the answer lies in food science, not genetics.