You might go to the grocery store and look for foods that claim "fat free" status, whether that means trans fats or any at all. In reality, those foods probably have fat in them and the nutrition facts just don’t tell the complete truth.
from Lifehacker http://feeds.gawker.com/~r/lifehacker/full/~3/Rq_ecQPp2Kk/what-fat-free-actually-means-on-a-nutrition-label-1427309460