This is on the TV in the background right now.

And I just found an article about it.
Lying Food Labels - MORE Magazine - For Women 40 Plus Basically, FDA guidelines allow food companies to have a margin of error of up to 20% on their food labels. That means that the food you buy could (and often does) have 20% more calories, 20% more fat, 20% more everything than the package label says it does. In fact, on the news here they've done some tests in their own labs and found food packages (mostly frozen meals) that actually had 350% more fat than the package label said. What do you think? Is the margin of error that the FDA allows too high?