According to a study published in the American Journal of Public Health, overweight adults have a significantly higher incidence of premature death and CVD (cardiovascular disease).
"Compared with normal-weight adults, obese adults had at least 20% significantly higher rate of dying of all-cause or CVD. These rates advanced death by 3.7 years (grades II and III obesity) for all-cause mortality and between 1.6 (grade I obesity) and 5.0 years (grade III obesity) for CVD-specific mortality. The burden of obesity was greatest among adults aged 45 to 64 years for all-cause and CVD-specific mortality and among women for all-cause mortality. Conclusions: These findings highlight the impact of the obesity epidemic on mortality risk and premature deaths among US adults."
View the results of the study here: "Body Mass Index Categories and Mortality Risk in US Adults: The Effect of Overweight and Obesity on Advancing Death"