I have put this in health rather than Aibu as I hope to have a reasoned discussion rather than a hysterical shouting match. So.
I teach teens and have done for 20 years. There were always lots of well-rounded girls (and lots of skinny ones too, obv) but in the last year or two I've noticed increasing numbers of overweight/obese boys (yes, the majority remain skinnyish). I currently teach about 150 kids per week, and overweight boys outnumber overweight girls. This is particularly the case in the younger year groups.