"I think it's hard (or expensive) for people eating out to get a healthy meal, especially in the US."
My son has significant medically diagnosed food allergies, wheat, soy, casein (milk). We've been living this for 7 or 8 years. Trust me, overwhelming at first, but eventually you get used to it...
Salad. Doesn't have to be boring either. Seems like any animal you can grill can be sliced up and dropped on a pile of yummy seasoned vegetables and fruits and nuts. Go very light on the salad dressing, ask for it on the side rather than dumped on top to create the typical salad dressing swimming pool.
Careful selection of side dishes turns the stereotypical restaurant steak dinner into a pretty reasonably paleo meal.
If you think about it, for a light winter lunch, stereotypical no-bean chili is meat, tomatoes, and spices, not much to complain about if you don't dump crackers/sour cream/cheese all over it.
Fajitas also worked well for me. A fajita wrapper only weighs a couple grams, and restaurant dining is a special event... everything else is mostly paleo diet. Look out for soy flavoring and corn syrup in the sauces.
Stereotypical roasted beast dinner is usually OK. A slab of beef roast with veggie sides and fruit salad... stay away from the garlic bread and (usually) the gravy.
Most non-grain breakfasts are paleo. Whats not to like about an omelette, or a hash, ye olde bacon and eggs, etc. No pancakes and syrup, and no toast, obviously.
Depending on your medical orders (prescription?) or diet choice, your first month or two will be all "Oh no I am gonna starve!" but after awhile that problem just melts away.