Why do people need to breathe? Because the organism needs a constant source of energy for its use in order to sustain life. The process is that the oxygen inhaled through the lungs is oxidized in the body with nutrients, producing energy for the body to use. This oxidation reaction produces a waste product, carbon dioxide, which is exhaled out of the body via the lungs. We call this process energy metabolism. The level of energy metabolism varies according to people’s activity (mainly physical strength). Even when people are asleep, this metabolism continues because of the heartbeat, the breathing movement of the thorax, the adjustment of the sleeping position, the digestion and absorption of the digestive tract, the thinking activity of the brain caused by dreaming, the information gathering activity of the five senses and the skin, and the movement of the cells of the tissues and organs. The level of energy consumption is very low, therefore, the frequency of breathing is very slow and the amplitude is very small. In other words, the amount of gas exchange through the lungs per unit time is minimal at this time. When people wake up, with the increasing physical activities (dressing, bedding, washing, meal preparation, eating and morning exercise), energy consumption increases, and the frequency and amplitude of breathing increases, which means that the number of gas exchanges also increases. What does the phenomenon of faster and deeper breathing mean? It means that the level of energy consumption of the body is increasing and the demand for nutrients is increasing. Thus, it seems that the changes in the level of energy consumption of the body can be observed by the changes in the body’s respiration (except in patients with cardiopulmonary failure). After breakfast, people start their activities, some are in meetings, listening to lectures, taking notes, reading, discussing, playing chess, playing cards, some are doing housework, shopping, watching children, crowding buses, and others are exercising physical fitness, dancing, swimming, carrying heavy objects, etc.. They all have different breathing rates and amplitudes. The more activity, the more physical effort, and the colder the environment they are in, the faster and deeper they breathe. According to this reasoning, we should take the daily physical effort (breathing fast and slow) as the basis, and eat moderately, so as to stay away from “three high” and other rich diseases.