Resistant starch intake facilitates weight loss by reshaping the gut microbiota (nature.com)

If you scroll down at the nature's article referred to in https://news.ycombinator.com/item?id=39592367 you'll find the linked study.

And https://en.wikipedia.org/wiki/Resistant_starch notes: > Resistant starch does not release glucose within the small intestine, but rather reaches the large intestine where it is consumed or fermented by colonic bacteria (gut microbiota).

You don't need to buy expensive supplements, as resistant starch is easy to obtain, because starch from noodles, potatoes or rice for example partially converts to resistant starch when cooling down long enough.