Coffee contains minerals, vitamins, chlorogenic acid, caffeine and phytochemicals and other substances, moderate consumption can play a refreshing, increase satiety, antioxidant effect, but if you drink too much coffee in the short term or long-term consumption of large amounts of coffee may have an impact on the health of the body: 1, affect the function of the nervous system: too much coffee may produce greater stimulation of the nervous system, manifested as excessive excitement, insomnia, etc. Insomnia, etc., research has found that long-term consumption of large amounts of coffee, but also easily lead to widespread depression, anxiety, irritability, memory loss, insomnia aggravated; 2, affect the gastrointestinal tract function: large amounts of coffee can easily cause stomach discomfort, coffee ingredients can increase the secretion of gastric acid, aggravate the stimulation of the gastrointestinal mucosa, gastritis and peptic ulcer patients drinking more likely to cause discomfort, such as heartburn, stomach pain, bloating 3, affect the heart function: caffeine can increase the heart rate, a large number of coffee may appear tachycardia or other arrhythmias, manifested as panic, sweating, etc., especially people with underlying cardiac pathology, the intake of more caffeine is very likely to induce arrhythmias; in addition, prolonged consumption of coffee, especially coffee with coffee partners may also cause patients with elevated cholesterol; 4, affect the kidney Function: Caffeine has a diuretic effect, short-term heavy drinking may cause dehydration during exercise, long-term excessive coffee consumption may also have a negative impact on kidney function; 5, other: excessive coffee consumption may also increase cholesterol, affecting calcium absorption, resulting in osteoporosis, may also have a negative impact on the preparation period, women during pregnancy and fetus, long-term consumption of coffee stains may also make teeth Yellowing. Coffee can be refreshing, many people like to drink coffee in study and work, but need to pay attention to the amount of intake, to avoid the adverse effects of excessive coffee on the body.