Which really points, if you can believe any of the competing studies, to what mom and grandma told us all as kids. Moderation, exercise, healthy fats, fruits and vegetables. Mediterranean diets achieve this. I have memories of my grandfather eating lard sandwiches. That's right, lard, sliced about 1/4 inch thick (ugh), on brown bread, sometimes with a thick slice of raw onion. He died at 92, after a misdiagnosis (he had pneumonia) sent him home instead of to the ICU.
I was about to say the same thing. Basically "Everything in Moderation". Boom, thats it. We are fatter as a society simply because we are eating more and exercizing less. Some of the new foods we eat (lots of trans-fats, basically artificial fats created in a lab) are also bad for us, go figure, we never evolved (and/or God never made us) to eat them. But even if you eat some of those "Bad for you" things, if you just eat less overall, you will be healthier, bottom line. The calorie reduction people are on to something.