Yeah, fast food is usually equated with fatty foods, but a recent Yahoo article points to the healthiest restaurants to eat at. The top-three were Chick-fil-A, Subway, and Jamba Juice (who really eats at Jamba Juice, come on). But I wanna brag a little because Taco Bell came in fourth with a B+ rating.
If you want to eat healthy, stick to the Tacos and the Bean Burritos (as the article mentioned). Avoid the fried foods, the Taco Salads, and anything with layers. If you wanna add some ingredients add some fiesta, add some lettuce, even some tomatos and onions...is there really a need to add extra, extra nacho cheese and chili sauce to everything.
For the most healthy, use the fresco menu. That's gonna lower the fat content by taking away the milk ingredients and adding our fiesta salsa.