Generally speaking, under the premise of controlling intake and actively exercising to increase consumption, moderate consumption of iced American coffee has a certain role in helping weight loss. The main reason is that the caffeine contained in iced American coffee has a certain role in promoting gastrointestinal peristalsis and diuretic effect: 1, promote gastrointestinal peristalsis: the caffeine contained in coffee can excite the central nervous system, stimulating the smooth muscle excitation of the gastrointestinal tract, which can promote gastrointestinal peristalsis and help digestion; 2, diuretic effect: caffeine can also increase the blood flow of the glomerulus, inhibit tubular reabsorption and produce some Diuretic effect, to a certain extent, can relieve the facial edema of certain people, thus visually manifesting as thin, but the diuretic effect of iced American coffee is not a substitute for drugs. Weight regulation is related to the total daily caloric intake, metabolic calories and basal metabolic rate, and does not rely entirely on iced Americano, so it is not certain that drinking iced Americano will achieve weight loss. People who want to lose weight can do so by reducing their total daily dietary calories, increasing physical activity and eating fiber-rich foods, or drinking unsweetened coffee to promote digestion. It is important to note that iced American coffee with extra artificial sugar and phytolipids and other ingredients containing more trans fatty acids to increase the taste, but make the energy increase, may lead to weight loss failure. Moreover, the caffeine can stimulate the secretion of gastric acid, so the gastric mucosa stimulation, long-term fasting iced American coffee may lead to gastric mucosal damage, patients with chronic gastric disease should not drink. Special groups, such as pregnant and lactating women, as well as those suffering from other diseases, should use iced Americano to help lose weight with caution to avoid adverse consequences.