This seems to be an interesting documentary covering the scenes behind America 'S fast food industry. Check the Amazon. com-Website for further information and comments on Fast Food Nation or go directly to the official website here.... See Trailer.
Supersize Me (2004)
"This documentary-style propaganda film chronicles the month-long fast food binge of writer/director Morgen Spurlock....."[more...]. Here are two clips from YouTube: Clip 1 and clip 2.
Soylent Green (1973)
A dystopian view on a far distant future when to feed the world becomes difficult due to food scarcity and empty seas. See trailer and scene 1 and scene 2: Sol goes home. What is Soylent Green? [more...]. About the film see page on Scfi.com . More information see here.