Why do we have so much obesity and diabetes?

Sustainable Foods.  How did our health change so fast and consistantly for so many people?  When you compare the food eaten today (Chemicals, antibiotics added, artificial flavors  and lots more sugars) to what the average persons diet was in the 1950s, you can easily see why we have the health problems we see today.

http://www.youtube.com/watch?v=-anCk_QO0J8&feature=player_embedded