Obesity and Overweight

Obesity has become a significant public health issue worldwide over the last four decades.[1] It is caused by excess body fat accumulation, which is harmful to health. Obesity is defined by the World Health Organization (WHO) as body mass index (BMI) ≥30 kg/m2, while overweight is the BMI of ≥25 kg/m2.[2] The prevalence of overweight and obesity is increasing globally in both developing and developed countries in all age groups.[3] Since 1980, globally, its prevalence is almost doubled.[4] The WHO has reported that in 2016, more than 1.9 billion adults were overweight; among them, 650 million were obese.[5] In the United States, the prevalence exceeds 30% in most sex and age groups.[6] Besides, this trend of…