The older we get, the longer our bodies take to break down food. Even if you monitor the amount of food you eat, it's inevitable; you'll gain some weight. Some people may see changes in their metabolisms as early as age 30. The ketogenic diet helps promote weight loss by boosting your metabolism and reducing your carb intake. According to Harvard Health, keto is the ultimate low-carb diet. Keto is ideal for anyone that wants to reduce the number of carbs they consume daily, in addition to a reduction in appetite.