Lean Boost Keto Research has shown that adopting this low-carb, high-fat diet can promote fat loss and even improve certain conditions such as type 2 diabetes and cognitive decline. With the keto diet your meals are 70 or 80 percent fat; about 20 percent protein; and about 5 percent carbohydrate. When in a day you consume less than 50 grams of carbs, your body will later run out of fuel (blood sugar). This typically takes 3 to 4 days. Then you’ll start to break down protein and fat for energy, which can make you lose weight. This is the process that naturally occurs in the body called ketosis.