Overweight Americans may be a funny bunch, but it's difficult to laugh when your stomach is knotted in hunger.
While Westerners suffer the diseases of affluence, the remaining world suffers malnutrition. See this photo from the September/October 2001 issue of Adbusters.
The immorality of meat consumption is not limited to world hunger. The meat industry has historically treated its workers abysmally. See Upton Sinclair's The Jungle or Chapter Eight of Eric Schlosser's Fast Food Nation for details.