... to lose weight, I'm trying to limit myself to the following chain restaurants.

McDonalds -- Hardly my first choice, but Danny likes it. Fave: the grilled chicken sandwich (hold the mayo), Diet Coke. I may stop ordering fries -- that's what does it, you know.
Subway -- Lots of choices that are yummy, and I always leave without feeling grossly full. Faves: the sweet onion chicken sandwich or roast beef, no mustard or mayo, yogurt as a side, Diet Coke.
Arbys -- Pretty good place; I wish the roast beef were better. Fave: The Super (add lettuce & tomato), no fries, Diet Pepsi.
Boston Market -- Again, lots of good choices. Fave: 1/4 white, corn, Diet Coke.
Culvers -- This is hard; Culvers is awesome. But I can do it. Fave: Angus steak sandwich, salad or soup, Diet Pepsi
Wendys -- The drive-through was their idea, you know. Fave: Grilled chicken, side salad, Diet Coke.

Also:
Portillos (grilled chicken sandwich, no fries)
Sweet Tomatoes (just everything in moderation)