We don’t know. For long term studies, people usually eat both fruit and veg. There aren’t going to be many studies for someone just eating vegetables.
So what we do know is that people who eat both fruit and veg have better health outcomes. There are lots of reasons to think having a varied diet is best for health.
So we do have good evidence that people who both fruit and veg have good health outcomes, but we don’t have good evidence that you can just eat veg alone and have the same benefits.
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