Many girls choose to drink coffee or strong tea to lose weight, although the caffeine contained in both can accelerate metabolism and make them excited, which really has the effect of slimming. But at present, coffee companion, a plant powder, will be added to coffee, which is particularly high in calories. Long-term intake will make the body consume too many calories and turn them into fat accumulation. Drinking strong tea before meals will aggravate the symptoms of gastric ulcer and duodenal ulcer for people with bad stomach. Drinking strong tea after meals, tea alkaloids stimulate the central nervous system, which will increase the metabolic rate of human body, promote the secretion of gastric juice and the digestion of food, but will accelerate the speed of human hunger.