1. West Virginia (38.1%)
2. Mississippi (37.8%)
3. Louisiana (36.5%)
4. Arkansas (36.4%)
5. Alabama (35.7%)
These states have the highest prevalence of obesity among adults aged 18 and over. Obesity is defined as having a body mass index (BMI) of 30 or greater. BMI is calculated by dividing weight in kilograms by the square of height in meters.