The claim. Arby's and KFC say that their fries are free of heart-unhealthy trans fats (officially, "free" means there's less than 0.5 gram per serving). Wendy's says that a large serving has 1 g. McDonald's and Burger King list larger amounts but say they're reducing their use of trans fats in some restaurants, notably in New York City and Philadelphia, where foods served in restaurants must be free of trans fats by next summer. Last year, we found that fries in Wendy's restaurants in the New York area had more trans fat than claimed.

The check. For each of the chains, we bought and analyzed fries from five to nine restaurants in five states.

CR's take. In our sampling, Wendy's still missed its mark. So did Burger King. McDonald's fries claim a high 8 g for most locations and 0 g for New York City, and they met those claims. The best way to cut trans fat from fast-food fries? Try to stick with fries from Arby's or KFC, which were virtually free of trans fats (and choose a small serving).