Here's a List of some fast Food restaurants with below each which items are the healthiest:

McDonalds-
Chicken Oriental salad
low fat dressings
Whole wheat Chicken McGrill with BBQ sauce
Chicken Protein platter
Fruit & Yogurt Parfait (hold the granola)

Wendy's-
Mandarin chicken salad
Spring Mix Salad
low fat dressings
Ultimate Chicken grill plus side salad
Large chili plus side salad
Jr. Frosty Dairy Desert

Burger King-
Fire-Grilled Chicken or Shrimp Garden or Caesar Salads
fat free dressings
BK Veggie Burger + side salad

Harvey's-
Entree grilled Chicken Caesar or Garden salad with light dressing
Beef barley Soup
Chicken Noodle Soup
Harvest vegetable Soup
Signature grilled Chicken Burger
Veggieburger

Subway-
6" SUBS:-
Roast beef
Oven roasted chicken breast
savory turkey breast
Turkey breast, ham and roast beef
Veggie Delite
Sweet Onion chicken Teriyaki
Ham
Deli-style sandwiches:
Ham
Roast Beef
Savory Turkey breast

Salads:
Garden fresh
Mediterranean Chicken

Dressings:
Honey Mustard
Red Wine vinaigrette
Sweet Onion

Tim Horton's-
Sandwiches- on brown
Garden Vegetable
Harvest turkey breast
Tuna salad
Turkey Bacon Club
Chicken and roasted red Pepper

Soups-
Chicken Nodle
Vegetable Beef barley
Hearty Vegetable
Turkey and rice
Chicken Gumbo
Tomato Florentine
Minestrone
Beef Noodle
Chili

Swiss Chalet-
Santa Fe Grilled chicken Salad
Vegetable Stir fry on Rice
Chicken Stir Fry on rice
Quarter chicken White(skinless0 with coleslaw/vegetables
Chicken on a Kaiser(eat open faced no top bun)
Dressings -lite or fat free only