I Think Yahoo Is Trying To Tell Me Something

For the past couple of weeks every time I send off an email through Yahoo I see this screen, complete with the ad at the right. An ad featuring a ripped, half-naked guy asking me how much weight I want to lose.

What the hell are you trying to say, Yahoo? Are you telling me I'm fat?

I won't deny that I could stand to lose a few pounds. Who among us couldn't? What I don't understand is how Yahoo knows this. Does everyone with a Yahoo account automatically see this ad, regardless of of their girth? Or does Yahoo use some kind of algorithm that secretly searches the content of my emails, looking for key words like pudding, bratwurst and smorgasbord?

Do my emails make my butt look big?