Cancer, breast cancer, skin cancer, especially.
This is closely related to the fact that Americans have eaten less high-fat and high calorie foods in recent years, quit smoking, stopped taking estrogen, and reduced exposure to the sun. But what makes American experts feel most useful is exercise. They even listed the discovery as one of the "top ten medical breakthroughs" in 2009.
Exercise can prevent cancer mainly because, first, exercise can reduce the transmission time of food in the intestines and stomach, which will reduce the time for the absorption of carcinogens in the food, and can effectively prevent gastrointestinal tumors such as colorectal cancer.
Second, regulating hormone secretion level can prevent breast cancer and other hormone level related cancers; Third, regulate the immune system. A healthy immune system is the most important part of cancer prevention. Now many people in the United States move for 30 minutes a day.
As for the best exercise prescription, experts from the American Sports Association believe that aerobic exercises such as jogging, cycling and swimming are the most appropriate. Exercise 3-5 times a week for about 30 minutes each time. The intensity of exercise should be controlled so that the heart rate during exercise does not exceed 70% of the maximum heart rate and not less than 50% of the maximum heart rate.
