Chen Y, et al. - Researchers investigated if body mass index (BMI) and waist circumference are associated with all-cause mortality in a general adult population from the China Health and Nutrition Survey. According to World Health Organization recommendations, they divided the general adult population into underweight (BMI < 18.5 kg/m²), normal weight (18.5 kg/m² ≤ BMI < 23.0 kg/m²), overweight (23 kg/m² ≤ BMI < 27.5 kg/m²), and obese (BMI ≥ 27.5 kg/m²), as well as abdominal obesity (waist circumference value ≥ 90 cm for males and ≥ 80 cm for females). Observations revealed lower all-cause mortality in young males and middle-aged females who were overweight; however, an opposite association was observed in all elderly participants who were underweight. Reduced all-cause mortality in elderly females was observed in correlation with abdominal obesity.