Billions of people worldwide drink coffee to get more energy, feel more alert, and improve their athletic performance. One cup of coffee contains between 100-250 milligrams of caffeine. Caffeine is a diuretic and an alkaloid, which means it increases urination, is metabolized in the liver and excreted through the kidney. One study from Duke University suggests that caffeine often masks hunger and fatigue because it acts as a stimulant, providing a short-term boost in energy and alertness.
Coffee also contains phytochemical compounds called chlorogenic acids. These acids are an important group of biologically active and antioxidant dietary phenols. Their ability to control hunger and suppress appetite is one of the reason you feel full after a cup of coffee.
According to several studies, regular coffee reduces our risk of developing diabetes, mental illness, many cancers, and overall mortality. However, not much research has been done on how coffee might affect appetite. Although, evidence so far has indicated that coffee helps to suppress your appetite, not encourage it.
Going above the recommended daily allowance (RDA) of caffeine which is around 400 mg may cause serious health conditions. Drinking coffee in moderation may boost your metabolism and reduce your desire to eat.