In the fast pace of modern life, coffee has become a necessity to stay up late and work overtime. But recently, a friend reflected to me, said he stayed up late writing programs in order to refresh always drink coffee, at least 2 to 3 cups a day. But the last few days but dare not drink again, drink a small heart will immediately ‘thump’ jump, serious when the hands are followed by shaking, which scared him, thought he had a heart attack. The coffee will drink a heart attack? The main component of coffee is caffeine, which stimulates the central nervous system, heart and respiratory system. Patients with coronary heart disease, hypertension, diabetes and insomnia should not try, otherwise it is easy to excite the human nerves, stimulate the excitement of the human state, causing the heart rate to accelerate, increasing the heart responsible. The netizen’s condition should be the palpitations and muscle twitching caused by excessive caffeine intake. Especially after drinking a larger amount of coffee, caffeine gathers too much in the body, there will be adverse reactions to caffeine, such as heart palpitations, dizziness, weakness of the arms and legs. Nowadays, many people in the city are in a subhealthy state, plus staying up late, will be more sensitive to caffeine. But if you belong to the upper genus of people, plus the effect of caffeine, if the emotional tension again, the danger will rise sharply. The two problems of drinking coffee on an empty stomach to lose weight and drinking coffee regularly will lead to osteoporosis circulating on the Internet are also relatively one-sided. Many people believe that drinking coffee in the morning on an empty stomach can eliminate the hangover detoxification, but also can play the effect of weight loss. In fact, this method of weight loss is not advisable, the reason why coffee on an empty stomach will have a weight loss effect, because the gastrointestinal after a night’s rest, the morning after drinking coffee on an empty stomach, caffeine will stimulate the gastrointestinal, which in turn affects the normal absorption of nutrients at breakfast, ultimately leading to weight loss, which is a very unhealthy practice. In particular, people with stomach ulcers and heartburn symptoms should drink less or try not to drink coffee. About the onset of osteoporosis and individual factors, dietary habits, lifestyle habits and many other factors, caffeine in coffee has a diuretic effect, which will increase the excretion of calcium in the urine, as well as promote the secretion of calcium in the small intestine, there is a high probability of increasing the possibility of osteoporosis. But this situation is for, usually food would have lacked to take enough calcium, or not often move people, especially women after menopause, the lack of estrogen will cause calcium loss, this situation plus a large amount of caffeine, may lead to osteoporosis. Coffee is not not to drink, but usually pay attention to a balanced diet, drink more fresh milk, more sunshine, supplement calcium, and adhere to exercise.