I have had a unique view of how much damage fried and fatty foods can cause.
I first went to the Cook Islands about 10 years ago. At that time, there were a few restaurants but most people ate at home - a diet of mostly fish, chicken, taro and coconut plus lots of fresh fruit. The TV stations didn't come on until 5 pm and seemed to be mostly news shows with the occasional movie or sitcom. Almost all the kids and adults I saw were slim and healthy looking.
3 years later, I went back. By then DVDs had become popular but the food was pretty much the same. I noticed that some of the kids in my friend's family had gained a fair amount of weight - and their parents complained that the kids would not do chores and were glued to the movies.
I went back last year. Fried chicken and pizza have come to the island. I notice that a lot of the food is coming out of cans. TV is more varied and comes on earlier. Most of the kids stayed glued to screen - I rarely saw any on the beach. They also looked unhealthy - sores on their legs, acne, slouching, and of course outright obesity. The adults were also unhealthy, compared to even 3 years before.
So there it is, all in a nutshell.