What's humorous about a copywriter who wants to gain weight?

The copywriting humor that wants to gain weight goes like this:

1, others are losing weight and I am gaining weight. After all, the fleshy figure can better embrace life?

My plan to gain weight is not a joke, I'm serious! Because I heard that only having enough fat can better resist the cold. Winter is coming, I don't want to be blown away by the wind!