Many people say that drinking more coffee can lose weight. In fact, caffeine can accelerate the decomposition of fat and separate fatty acids into the blood. If you take part in sports and burn fatty acids in your blood, you will definitely lose weight. However, to achieve the effect of separating fatty acids, you should drink at least 8 cups of coffee every day. Such a large amount will definitely make you suffer from insomnia for a long time, and it will also lead to water shortage, skin deterioration and affect metabolism.