wie viele ballaststoffe hat eine banane — can a DNA test help?

This question combines two distinct aspects: the fiber content of a banana and whether a DNA test can help determine that. A medium banana (about 100–120 g) contains roughly 2–3 g of fiber, mainly pectin and resistant starch (in unripe fruit). This is a basic nutritional fact, independent of genetics. A DNA test cannot tell you how much fiber a banana has – that's a matter of food composition tables, not genetic analysis. However, DNA tests might theoretically offer insights into how your body processes fiber or your risk for conditions where fiber intake matters (e.g., blood sugar control, gut health). The evidence for such personalized recommendations is weak to moderate. Most consumer DNA tests lack clinically validated guidance for fiber intake. In summary: bananas reliably provide fiber; a DNA test is unnecessary for this question and does not provide a direct answer.