A few years ago I tried to go vegetarian, but my body couldn't handle the diet and I got sick. Now I make a rarity of eating meat in general, especially red meat. From my experience (which of course could be way off) some people can take the veggie diet and some can't.

Meat is also often very unhealthy nowadays because of preservatives and other chemicals. Factory farms mean the constant injection of hormones and antibiotics in an attempt to supress an epedemic (i.e. mad cow disease). Ironically this will more likely lead to an outbreak of antibiotic-resistant bacteria.