Don't wait for thirst to drink water. Water is the most important substance to maintain the normal operation of human life activities, prevent diseases and strengthen the body. Insufficient water intake will not only lead to listlessness, dry mouth and general weakness, but also reduce the function of liver and kidney, accumulate toxic substances and take advantage of diseases. Thirst means that the water shortage in the body is quite serious. A comprehensive physical examination every year is one of the important measures for middle-aged and elderly people. Many painful diseases, such as tuberculosis, hepatitis, hypertension, heart disease and cancer, can be found early in physical examination and treated in time, with good results. It is an important way for human body to excrete waste and purify the environment in the body. Constipation is harmful because the toxins in feces stay in the intestine for too long and are easily reabsorbed into the body to produce toxins. It is necessary to develop the good habit of going to the toilet regularly every day. Even if you have no intention of defecation, you should squat down and form a conditioned reflex. As for urination, it is best to urinate every hour to reduce the stimulation of harmful substances in urine to the bladder, thus preventing the occurrence of bladder cancer. I want to sleep when I am sleepy. Many people don't sleep when they are sleepy, saying that being sleepy is a signal that they should sleep. In fact, drowsiness is a sign that your brain is quite tired. You shouldn't wait until this time to go to bed. Developing the good habit of going to bed on time can not only protect the brain and make it easy to fall asleep, but also improve the quality of sleep and reduce insomnia. You can't wait until you are hungry. Some people in life don't eat on time, but don't eat when they are not hungry. This practice is easy to damage the stomach and weaken the body's disease resistance. Because food only stays in the stomach for four to five hours, when people feel hungry, the stomach has already been emptied. At this time, the gastric mucosa will "self-digest" gastric juice, which is easy to cause gastritis and peptic ulcer.