“Many bodybuilders are vegetarians.”
Do you have a link to support this claim?
My impression by reading Bodybuilding.com and learning about what serious bodybuilders eat I really can’t find any vegetarians.
My impression is that only about one percent of bodybuilders who compete are vegetarians.
Plant material has “protein” but beans and legumes do not have the same quality as fish, eggs, chicken or beef.
I just provided a list of prominent athletes who are vegetarian and there are many more who aren’t on the list. Just because the numbers may not be large, though they are probably more than most people would suspect, doesn’t mean it can’t be done by most people.
It comes down to personal choice.