Ketosis is a metabolic state in which your body burns fat for fuel instead of carbohydrates. When you eat very few carbs, your body runs low on glucose, its primary energy source. In response, the liver starts breaking down fat into molecules called ketones, which can be used for energy. This process can help with weight loss and improve mental clarity for some people. Many people achieve ketosis through a low-carb diet, often referred to as the ketogenic diet. This diet typically includes high amounts of fats and moderate protein while drastically reducing carbohydrate intake. As a result, the body adapts to using fat as its main energy source, leading to various health benefits.