Here are some of the things that happen when someone drinks coffee The odour of the coffee itself produces stimulating effects in various parts of the body The blood vessels in the brain are dilated so that circulation is improved and this removes some of the fatigue toxins from the brain Coffee increases the tone of the muscles so they can work harder The intestine becomes more active becauase of coffee which has a slight laxative effect Coffee makes the gastric glands secrete more actively For healthy people this is desirable especially after a heavy meal But for others it may produce hearburn Coffee also helps the body remove salt from the blood