I think carls jr lets you "build your own meal" nutrition widget thing. I like them for the $6 burgers, you can even get a double or just ask for a plain patty! I used to get the taco salad (would freak them out when I asked for it without the shell.. They didnt know what to do with it-Im like, put it in a salad bowl! )

and in n out is a low carber's paradise...

Speaking of LC paradise, if he can find a saladbar/deli kind of place, they appear a lot in downtown business districts, they often have hot offerings, you can pick and choose what you fill your plate (or to go container) with.