What I meant by that is some people don’t know how to eat a balanced diet. If someone suddenly decides they are vegan and doesn’t learn how to eat correctly (e.g. they start eating nothing but noodles and bananas), they could run into trouble.

Just to clarify, it’s dramatically better for the environment, not necessarily for the individual’s health. Although a vegan diet can be healthy for the individual, too. You just have to know what you’re doing.