Yes they (WE) are all getting fatter due to modern conveniences, more availability of fatty foods, etc. Back in the days hardly anyone had a car or even a passola, but now everyone does so nobody walks anywhere. It used to be you drank water with your meals and soda was almost an indulgence - Something you'd drink once in a while - but now everyone has a soda or beer with their meals and not to mention the fast food chains you now have in the larger cities.
In places like Cotui there were no pizza places until about 8 years ago, now they are all over the place and of course people looove them.
Attitudes are changing though. It used to be that to be "gordito" was a sign of prosperity, but now is just that you're fat, so the good thing is that in places like Cotui where again there was none of this in the past now we have like four "gyms" as well and you now see people walking or jogging by the Dam, including me.