Nick NorwitzMD PhD, Oxford-Harvard | Metabolic Health Educator | “Stay Curious”

Green Bananas & Fat Loss? The Science of Resistant Starch

19 Mar 2026 · 1 min

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0:49

In this brief explanatory video, the presenter explains why green bananas are of interest for fat loss: they contain type 2 resistant starch, a crystalline form of starch that resists digestion in the small intestine. Human controlled‑trial data are cited showing that consuming this starch can reduce total and especially visceral body fat without altering calorie intake. The presenter describes the proposed mechanism: the undigested starch reaches the large intestine, reshapes the gut microbiome, and alters microbial metabolites and hormones, which in turn affect body composition. Viewers are encouraged to explore a deeper‑dive link for more detailed information.

Chapters

Why did I pick up the green bananas? It's because they contain a molecule called type 2 resistant starch. It's a really cool class of molecules that has been shown in human controlled trials to reduce total body fat and especially visceral fat. Get this, in a calorie controlled manner, independent of calories. The way it works is the starch, it's not like a fiber or your typical starch. It is in this tight and packed crystalline form. So it evades digestion by your enzymes in the small intestine, then gets into the large intestine where it changes microbiome structure and the hormones, secondary bioacids, that your microbiome produces. This is how, in a calorie-independent manner, it changes your body composition, lowers visceral fat. It's a really cool class of molecules that you should definitely learn more about. If you want to, check out the deep dive link below. It's super cool.