Impossible to state a list since I would never be required/forced to eat chain restaurants for the rest of my life. I'll continue eating the foods that I grow.
I can't even come up with 5 chains I would eat at, let alone eat at the rest of my life. It doesn't seem it would be a long life, but judging by the FB cooking and cooking device groups, apparently lots of people have been surviving on chain restaurants all their life so far.
I'm going with all fast food because it's too hard to narrow it down with all restaurants and most of our chain eating out is fast food on road trips. I've spent the last 5 years commuting between two states and these places have been my life. Most of them are chosen because I can make some reasonably healthy choices for a reasonable price. Pita Pit, Qdoba, and Subway have been my life. So bummed we don't have a Pita Pit or a Qdoba locally. Now that I don't go to the other state all the time I MISS PITA PIT! I went from eating there about 6 times a month to cold turkey.