Technically, insulin's job is to signal cells to open up and take in nutrients for storage. It's highly insulinogenic carbs that can be problematic when dieting, easily countered by cutting out sources of processed/added sugar. Sorry - nerding out a bit as nutritional strategies for the obese vs athletes (strength/endurance focus) is an interested of mine. I can't take oats and bananas away from an Enduro-Dude, but Fatty McNeckroll can technically afford to lose all fruit and reduce their portion sizes for every meal by 20% without changing any other factor and lose weight.