I think avoiding industrially processed food is wise, but it eliminates 99% of restaurant food and 90% of prepared food in almost any setting, only exception being about half the stuff at a salad bar.
Almost everything that isn't a single ingredient whole plant or animal food contains industrially processed oil or sweetener/starch.
Still worth doing imho but I understand why it's not easy for most people.
It doesn't have to be a religion. I don't care when I eat out. The point is not to be absolutely consistant. It's just the guideline I use regarding what I eat.
I don't really eat prepared food. I mostly buy whole food to be used as ingredients. Cooking simple meals is not particularly hard. I think most people overestimate the complexity and time requirement involved.
Almost everything that isn't a single ingredient whole plant or animal food contains industrially processed oil or sweetener/starch.
Still worth doing imho but I understand why it's not easy for most people.