As a counter point, I've been vegetarian (ovo-lacto) my whole life. My parents aren't crazy, they just decided they wanted to be vegetarian, and the logical consequence of that is that my siblings and I were raised the same way.
I'm 6'1", ~175 lbs, and am strong and healthy. I've never had a blood test show any deficiencies. I don't have to go out of my way to find protein: dairy, eggs, and legumes are in enough dishes to make it easy. Plus, you don't need nearly as much protein as most people get.
Linus is often wrong about things, especially when they're outside his areas of expertise.
I'm 6'1", ~175 lbs, and am strong and healthy. I've never had a blood test show any deficiencies. I don't have to go out of my way to find protein: dairy, eggs, and legumes are in enough dishes to make it easy. Plus, you don't need nearly as much protein as most people get.
Linus is often wrong about things, especially when they're outside his areas of expertise.