It used to be said that drinking a cup of coffee before exercise can enhance endurance and help to lose weight. Experiments show that drinking coffee before exercise can really enhance endurance and lose weight. Research shows that athletes who consume a small amount of caffeine can tolerate more training time and higher performance than usual. Sports nutritionist, consultant of British Olympic delegation. After a cup of coffee or coke is absorbed by the human body, it can quickly promote the dissolution of fat into the blood, so that the human body can use fat as the main energy source before converting the limited carbohydrate reserves into energy.

In addition, caffeine affects the parts of the brain and spinal cord that deal with pain. Drinking coffee before exercise can relieve the pain caused by exercise. Drinking coffee can improve the excitability of the central nervous system, make the mind clear, increase the sense of pleasure during exercise and improve the agility of people during exercise, which is very beneficial to exercise. Although drinking coffee before exercise is beneficial to exercise, it should be noted that you should not exercise immediately after drinking coffee, otherwise it will increase the burden on your stomach. Caffeine will only be completely absorbed by the human body after drinking coffee for a few minutes, so exercising after drinking coffee for a few minutes can better play the effect of drinking coffee.

Pay attention to the amount of coffee before exercise, not the more the better. Drinking a small amount of coffee a few minutes before exercise really helps exercise. Recently, however, Swiss researchers found that drinking coffee before exercise may have a bad effect on the heart, because caffeine will reduce the blood flow of myocardium during exercise. The reason is that caffeine will hinder the specific receptors on the blood vessel wall, and exercise may hinder the normal information transmission of dilated blood vessels, thus reducing the blood congestion of the heart and affecting the oxygenation of the human body.

Generally speaking, coffee can stimulate the brain. Drinking coffee can improve physical fitness, and even be regarded by athletes as one of the drinks that can help them seek better results. However, because coffee will have a bad effect on the heart, it is not necessary to drink coffee often before exercise if it is only for fitness. Caffeine contained in coffee can be combined with free calcium in human body and excreted with urine.

The decrease of free calcium will inevitably lead to the decomposition of bound calcium, which will lead to osteoporosis. Drinking coffee will not only affect appetite, but also cause vomiting and spasm, and may also cause gastritis and thick tongue coating, thus making the body feel tired and weak.