I made the gross mistake* of viewing these two films in the same day, back to back. At the end of these I was so disturbed I thought I might not eat for weeks. To sum up each of these films … Supersize Me is a ground-level, personal view of the issues with our mass-produced food; Food, Inc. gives both a local & global view of massive 
production of food and how this affects health, national economies, and political decisions. Watch these, just maybe with a longer break in between the two films than what I took.
(*and I mean ‘gross’ in both ways)
Super Size Me on Wikipedia.org