That's great for you. Again I never said it was everyone. But a portion of people who try, sometimes a few years later, they find that they have low energy, muscle mass and strength loss. Especially athletes and extremely fit people. Sometimes women notice similar problems when pregnant, and they have to eat meat until they give birth, then give it up again.
Vegetarians and vegans frequently claim it's always great for everyone, and the few drawbacks are just people not doing it right. But that isn't always the case.