The increase in the number of chronic disease in the United States during the past 50 years is that the rate of physical activity has decreased in the United States during the last 50 years
Step-by-step explanation:
Chronic diseases includes the conditions that prevail over a long period of time and theses conditions include asthma, arthritis, cardiovascular conditions cancer depression and diabetes
The increase in the rate is due to that people has reduced their physical activity and the important cause is overeating and the physical inactivity and this will eventually lead to obesity and a gain in body weight