Final answer:
The main roles of the 3 main short-chain FAs are: Acetate serves as an energy source, Propionate modulates lipid metabolism, and Butyrate is a nutrient for colonic epithelial cells.
Step-by-step explanation:
The main roles of the 3 main short-chain FAs are: Acetate serves as an energy source, Propionate modulates lipid metabolism, and Butyrate is a nutrient for colonic epithelial cells.