Age is the biggest issue. Women & Men are roughly equally obese >65: https://www.cdc.gov/nchs/products/databriefs/db106.htm

It could be more related to smoking in older people?

> Generally, men tend to use all tobacco products at higher rates than women. In 2015, 16.7 percent of adult males and 13.6 percent of adult females smoked cigarettes.

https://www.drugabuse.gov/publications/research-reports/toba...