EUGENIZATION.

One seemingly strong argument you might have heard from vegetarians and vegans is, “Meat is bad for you, since all meat contains naturally-occuring trans fatty acids, which we all know are bad bad bad for you.” 

Well, half of the statement is entirely true: Meat (from ruminants) does indeed contain trans fats, as does dairy.  But the majority of these trans fats (naturally-occurring, not the man-made trans fats that occur when you bully a few extra hydrogen atoms onto an unsaturated fat) appear to be beneficial for reducing disease (Hat tip to Chris). 

So, I’m afraid you’ll just have to tell your vegetarian and vegan friends that they were mistaken: The naturally-occuring trans fat in meat and dairy (trans vaccenic acid) is actually good for you.

Don’t mess with Mother Nature.