With a ketogenic diet like Dimagra (high protein, low carbohydrate, low fat) the body uses up the existing glucose (sugar) it has. This reduces glycaemia, which in turn reduces how much insulin your body secretes. Your body then uses liver glycogen, converted into glucose. After around 12-24 hours, these reserves are depleted, Liver Gluconeogenesis begins, and ketogenesis is activated. This means your body uses ketone bodies, which are produced by an increased metabolism, or break down, of fatty acids.