Apart from just how terribly unreadable the chart is (my stats professor would have a fit over this), I would not be surprised to learn that the information it displays is mostly true.
I'm not quite sure I get the politics of the graphic though. I'm not exactly sure why a salad costs more than a Big Mac, but I am sure it's a lot more complicated than simply accounting for the cost of ingredients. Like it or not, salads are practically a niche at fast food restaurants. If you are the kind of person who orders a salad at a place like McDonald's, odds are you would order that salad regardless of price, if only because you are health-concious enough to never order a Big Mac.
Also, I'm not a fan of the way the chart would seem to suggest that the subsidies are misaligned with the Food Guide. I'd suspect it costs much more to to create meat products than it does to grow grains. With that in mind, it makes sense to give more to the cattle farmers that the corn farmers (if you're a supporter of subsidies
).