It’s simple really, your body can use carbohydrates (glucose) OR fat to provide the energy you need for your daily activities. However, it will always use glucose first. This is why it is so hard to lose weight! The body has a strong preference to store fat, not use it up. So, if you want to actually burn fat and lose weight you need to teach your body to work in a different way.
When you significantly lower your carbohydrate intake the body will naturally resort to using fat to obtain energy and will enter a state known as ketosis. In this state the body breaks down fat (dietary and stored fat) in the liver to produce ketones bodies which will now serve as the body’s main source of energy.
This will lead to weight loss, if you use up more calories than you take in. There are also many other health benefits of using ketones as a main source of fuel such as: controlled blood sugar levels, increased mental and physical performance and critically for weight loss a massive reduction in appetite and hunger.