re: GMO's and their impact on our weight.

AFAIK, GMOs are largely recognized as a failure and companies are starting to cut out a lot of GMOs. Well, that was a representative of a FDA that said that in a documentary, IIRC. But in any case, while I'd rather eat something that's natural, I don't think it's GMOs that are causing the obesity epidemic (although they certainly could be a contributing factor).
I think there's an amazing lack of nutritional education and exercise in our culture. Ever since the FDA put out the food pyramid, people have been taught that we should eat 6-11 servings of carbohydrates every day.. that carbohydrates should be the foundation of our daily diet. That would equate to ~300g of carbohydrates. At 4 calories per carb, that's 1200 calories just from carbs in a day. In a healthy male diet, a man should eat about 2000 calories a day. That leaves 800 calories for protein and fat. That is not a very balanced diet by any stretch of the imagination. It's lunacy. The human body needs healthy fats, plenty of protein, and it really doesn't need that many carbs. 150g/day would be more appropriate for the average person.

So, we have our schools teaching kids how to eat based upon a flawed nutritional guide, and the school feeding them crap meals most of the time. Then we have the technological age where most kids don't go outside and play, and finally we have parents that don't know anything about nutrition and don't try to learn anything. They then proceed to feed their kids like shite. See: honey boo boo.