What is your opinion on vegetarianism & veganism?

Do you think both diets are nutritionally sustainable in accordance with a healthy diet with sufficient vitamins and minerals?

I was vegetarian myself for about three years. But unfortunately, the meat cravings eventually kicked in. I felt hungry all the time when I was vegetarian. It was difficult. I may try it again at some point in the future. But I would need to make better dietary choices to stick with it.