Why are there so many more obese women than obese men?

I go to a random place, and I can usually spot about twice as many women who are obese than men who are obese, especially above the age 40. Why? Women generally care about their looks more and are valued for their looks more, yet they are also generally more overweight than men.
Update: Usually older men are bean pole skinny, whereas their wives are fat (50+ years old)
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