Day 3: McDonald's puts their nutritional information on the back of their tray liners, so at least they're transparent about how terrible some of their food is. You want fat and greasy? You can get it at McDonald's, but when it comes to lighter fare, they do have options.

One of my favorite breakfasts at McDonald's is their fruit and walnut salad. At 210 calories, it's more snack-sized than meal-sized, but the protein from the nuts and the yogurt can usually carry me through. But today I'm here for lunch. I decide on a grilled chicken salad -- all three are respectable, though you'll want to skip the high-fat Caeser and ranch dressings. The grilled chicken snack wraps would be another good choice, paired with a side salad.

My biggest complaint about McDonald's salads is the lettuce, a boring and tasteless iceberg. I wish they'd consider switching to fresh greens, which would make it a pretty decent lunch. I also think they need to add more low-fat dressings to their menu.