I need a cup of coffee when I wake up. The common theme, revealed by organizations such as The Centers for Disease Control and the American Medical Association, is that moderate intake of caffeine does not contribute to disease in an otherwise healthy person. It won't cause cancer. It won't cause high blood pressure. But it just might facilitate fat burning.
Caffeine speeds up our metabolism.
It also breaks down fat, freeing fatty acids which are immediately burned during exercise. Conversion of fat to energy is about 30 percent more efficient when caffeine is consumed prior to exercise. The caffeine-enhanced fat burning can occur only while we're exercising. Higher glucose levels ward off hunger. This is why coffee is popular among students and think-tankers.