what make vegetables profitable to human health?

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some says," I love to ate vegetables?". Others said, " I don't like to eat vegetables, but I'm still healthy". Few people said," I prefer to eat meat than vegetables". When I was young, my teachers said that we have to eat vegetables, because it can make us healthier. But other teachers of mine discouraged us to eat lot of vegetables. I want to have an idea how vegetables important to human?