According to the findings, 29.99 percent of the men were in the normal weight range. The number compares with 25.64 percent who were overweight, 35.74 percent who were moderately obese and 5.31 percent who were severely obese. 

Among men in their 30s, 46.26 percent were above the normal range of 23 in their BMI.

For women, 50.03 percent were in the normal weight category.
Underweight women numbered 7.78 percent, compared with 2.05 percent for men. Those who were overweight came to 18.33 percent, moderately obese 19.54 percent and severely obese 3.59 percent.

The report had measured obesity level in relation to the state health insurance payments, with results indicating that while wealthier men tended to weigh more, it was the opposite for women.

State health insurance payments go up with higher income and/or wealth.

Among men, the obesity level increased as the insurance payment amounts got higher. For instance, the obesity level was the highest at 37.36 percent in the second-highest insurance payment group. 

For women, however, the obesity level rose opposite to their insurance payments. The report showed that the highest number of obese women at 21.79 percent were in the lowest insurance payment group.

When it came to severely and very severely obese, both men and women had low income and/or wealth.

"The expected results were that the obesity level would have a U-shape, because generally speaking, people with higher income would be more obese from consuming fatty foods and those in the low income group gain weight from eating instant and fast foods," an official from NHIS said. 

"But the big data analysis indicates that obesity shows up differently between men and women depending on income level." (Yonhap)