There are differences between vegan and being vegetarian. Vegetarians can still drink milk, eat eggs, and still have a decent amount of options for protein (tofu, beans, etc.). Drawbacks would definitely be just always having to find other options to eat. Friends going to a burger place? You probably cant join them. If you plan it right and really research being vegetarian it's healthy. As far as building muscle on it, I don't know enough to give you a great answer but I'm sure its much harder than people who can eat meat.
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