A no-sugar diet is very effective for fat loss. A few physiological changes occur in your body when you quit sugar.These changes help in the reduction of fat gradually. Within hours, the hormonal levels shift. Your levels of a hormone called insulin will start to come down. Insulin is an anabolic hormone that favors building up body mass or retaining fat within the body. It is tough to burn fat and lose weight when you’ve got much insulin circulating in the blood. However, when you stop eating sugar, it becomes easier for your body to access fat and burn it for energy. Over a few days and weeks, you will notice that the lipid levels in your blood will start to drop, especially stores of fat.