Drew over at How To Cook Like Your Grandmother has a great takedown of the supposed idea that a Big Mac is cheaper than a salad because beef is so heavily subsidized, a canard I've come across more than a few times. Here's a screen shot from this table at the Environmental Working Group:
Tell people to eat unhealthy food, use their tax money to subsidize the hell out of unhealthy food. And when everyone turns obese and diabetic go after Mickey D's. How's that working out so far?