BTW the movie is propaganda for a vegetarian lifestyle. There is no logic to his experiment; it tests and proves nothing. It only serves to make the viewer feel mild panic and hysteria about eating junk food (meat based junk food). The viewer is then introduced to a vegetarian diet, which looks "clean" and "pure" in comparison.
There's also a lot of anti-corporate propaganda in there too but the predominant theme IMO was pro-vegetarianism.