There are plenty of fat white kids out there. And furthermore, saying the Latinos have always been overweight...well was that before McDonalds and Taco Bell? Do you have any stats? That just sounds like a real general comment that begs for facts.
Also, have you ever traveled?
Looking at the white and Mexican men they are about the same weight
Note: Mexican men are also on average shorter.
I have traveled throughout the pacific, a little in the Caribbean and through out north America. Heading to Taiwan and Japan next week