Remember, insulin triggers an adrenalin response. Coffee, tea and colas stimulate the release of adrenalin, as does nicotine. All carbos stimulate the secretion of insulin. Fatty acids are actually the preferred fuel for building new muscles and for energy. A high-carbo diet means fat is deposited and it stays.
Dietary fats decrease the flow of carbos into the bloodstream and dampen the insulin response.
Dietary proteins enhance the mobilization of fatty acids from fat cells and fat loss. We need a balance. Weight loss on a high carbo diet is mostly water and muscle loss. Any subsequent weight gain is fat gain. Also, the more carbos you eat,the earlier adrenalin is produced as the blood sugar goes down.