I have been vegetarian all my life, that’s over 60 years now, and can say that provided one is aware of dietary and nutrition needs (and yes, have lots of that loverly cheese and omelets) one can easily stay healthy. However a vegan diet is another matter entirely, getting a balanced diet and enough nutrition is VERY difficult and such a diet should not be embarked upon without much research, it is not for the faint hearted or for those on a “fad” diet.
My aunt produce a recipe book with a number of vegan recipes and dietary advice during the war years when meat, eggs and cheese was in short supply for all urban British folks.
For those that are interested there are a few veggie recipes at
users.auracom.com/drawls/VegRecipies/VegIndex.htm including a great vegie burger and a campfire stew recipe for over the BBQ.