Drinking black coffee in the morning on an empty stomach usually does not achieve weight loss, in general, if you do not exercise, just by drinking black coffee, any time can not play a role in weight loss. And black coffee on an empty stomach may cause some stimulation of the gastrointestinal tract, causing digestive discomfort symptoms, so it is not recommended to drink on an empty stomach. Drinking black coffee on an empty stomach or drinking too much can easily cause abdominal pain, heartburn and other gastrointestinal symptoms, as well as gastric ulcers, gastroesophageal reflux and other diseases, and may also have a rapid heartbeat, restlessness, increased blood pressure and other symptoms. Although the caffeine contained in black coffee helps burn fat, but fat can be changed into free fatty acids under the effect of caffeine, if not consumed through exercise, free fatty acids in the body will soon revert to neutral fat again and cannot play a role in weight loss. For people who need to lose weight, they can do aerobic exercise after drinking black coffee, which can help promote fat burning and improve energy metabolism. However, some long-term black coffee drinkers may develop tolerance to caffeine, the long-term effect is not obvious, and may also have a stimulating effect on the body. Therefore, you want to lose weight through a reasonable diet, appropriate exercise and other ways to lose weight.