Obesity is a complex disease characterised by excessive adiposity that impairs health. Body Mass Index (BMI) is a surrogate marker of adiposity, allowing segregation of obesity into three levels of severity, including:
- Class 1: BMI of 30.00 kg/m2 to 34.99 kg/m2
- Class 2 (moderate): BMI of 35.00 kg/m2 to 39.99 kg/m2
- Class 3 (severe): BMI of 40.00 kg/m2 or higher.
Altered BMI criteria may apply to specific populations, such as the widespread use of lower BMI cut-offs in the Asian population.
Obesity may arise from different causes, including altered environments, personal situations and psycho-social factors, medications, diseases, trauma, iatrogenic procedures, and genetic variations.
The science behind Obesity