summarize it please~~ Obesity is an increasing public health problem in the United States (US) and much of the developed world. Being overweight is

summarize it please~~

Obesity is an increasing public health problem in the United States (US) and much of the developed world. Being overweight is defined by National Institutes of Health as a body mass index (BMI) ≥ 25 kg/m2 and obesity as a BMI ≥ 30 kg/m2. By these criteria, in 1960 approximately one in every ten Americans was obese, a number which has since tripled.1 At the same time the proportion of the population which was overweight remained constant; currently the majority of the population is overweight or obese. Perhaps most concerning, morbid obesity (defined as ≥40 kg/m2) has increased in prevalence from 1% of the population to 6%. The importance of obesity as a public health problem is difficult to underestimate; by some accounts2 it is destined to take over smoking as the leading cause of preventable death in the US and it may halt3 the improvements in life expectancy at a national level. Despite the known adverse effects of obesity on the development, severity and progression, it has repeatedly been shown that CHD patients with overweight or obese BMI and even BF have lower mortality, especially in combination with low CRF. Intentional weight loss remains protective and a goal in CHD patients. Above all, higher levels of CRF are associated with better prognosis in all populations of CHD and CV patients, and in most studies, an obesity paradox in not apparent in patients with high, protective levels of CRF. Therefore, improving levels of CRF may be even more important than improving BMI/BF in patients with CHD and CV diseases.