Nope, sorry, not Global warming. High fructose corn syrup, processed foods , and I think, the biggest, is gaming, screen time. They don't play anymore, if a kid does not care for Sports , that is okay, I didn't when I was a kid, but, there was no screen time except Saturday morning cartoons and Sunday nights watching Lassie. I played outside, I walked everywhere or rode my bike, my friends and I would spend hours outdoors, and we were not country kids, I was raised in Queens, NY. We were out till the street lights came on. We ate 3 meals a day and Mom would always have an after school snack, which was sweet, but that was it. Soda was for special occasions, parties, etc. My allowance was spent on candy, sure, until I discovered comic books. Microwave foods are the worst. I got rid of mine when I saw that my son started using it when he was 13, thinking he was learning to "cook". He was not allowed to use the computer unless it was supervised, I allowed play station at age 12, and when I saw he was getting addicted to it, I monitored that too, he would have to do homesteading outdoor chores before settling in. Parents use the screen as a babysitter, it works too well, kids plop their behinds down and snack.