Paleo sounds interesting, but the reality is that we are the 'cooking ape', and all too often paleo diets don't take that into proper account.
Humans can make almost anything edible, and digestible, by cooking it. Our entire digestive system, from teeth to gut shows that we are no longer designed to eat 'unprocessed' food in general.
The variety isn't so much a question of potential as available
On the choice option for meat eaters in vegetarian restaurants.....well I manage, but like a good Jewess who keeps dairy seperately, I keep specific pots, pans, utensils, etc., for meat prep and cooking.
Personally I like vegan restaurants because there's no potential for me to suffer a fish allergy attack
The blasted stuff is even in Worcester sauce.
cheers,
M