Robert, a professor of neuroscience and psychology at the University of Maryland, USA? Provine believes that humor can increase the number of immune cells in human body. Laughter can increase blood flow by 20% and reduce the risk of heart disease. Even if you pretend to smile, your body will release pleasant chemicals, which is good for your physical and mental health. Scientists have concluded that a good living environment can increase people's life span 10-20 years. Lush vegetation, good climate, fresh air, abundant oxygen, pollution-free water source and sunny and ventilated residence are all factors for longevity. Reasonable anger is good for blood pressure. Yes, anger can make people's blood pressure rise. However, the study of Carnegie Mellon University in the United States found that in the case of depression, responding appropriately with anger will not only maintain the normal level of blood pressure, but also reduce the secretion of cortisol, a hormone that creates stress. ?