Why does a salad cost more than a Big Mac?

Interesting graphic from Consumerist. Of course, those of us on the low-carb bandwagon do benefit more from the 73.8% of subsidies going to meat and dairy than the average American. Unfortunately, those subsidies are going to feedlots and the like, rather than small, humane farms selling to their local communities.
A more interesting graphic to me would emphasize not only how bad government food subsidies are for our health, but also for the planet. Not to mention inhumane. Any graphic designers around?