Comparison of the number of people according to the BMI classification by age group, South Korea, 2012 and 2040
| Population at baseline (2012) | Projected population (2040) | |||||
| 19–39 years | 40–64 years | 65 years | 19–39 years | 40–64 years | 65 years | |
| No of people | 15 491 561 | 18 591 360 | 5 759 809 | 9 462 607 | 17 246 520 | 17 109 681 |
| BMI (median) | 22.37 | 23.52 | 23.02 | 23.07 | 23.64 | 23.58 |
| Distribution of people by BMI classification | ||||||
| Underweight % | 11.76 | 5.10 | 7.60 | 2.66 | 0.00 | 0.00 |
| Normal % | 45.66 | 37.81 | 42.12 | 45.68 | 19.89 | 18.40 |
| Preobese % | 20.36 | 26.51 | 24.10 | 39.59 | 76.60 | 80.31 |
| Obese class Ⅰ % | 20.67 | 28.40 | 24.85 | 11.70 | 3.51 | 1.29 |
| Obese class Ⅱ % | 1.51 | 1.79 | 1.30 | 0.36 | 0.00 | 0.00 |
| Obese class Ⅲ % | 0.03 | 0.38 | 0.02 | 0.02 | 0.00 | 0.00 |
BMI, body mass index.