My answer would be more in terms of how many servings of fruits/vegetables should you have daily. Up to 4 fruits, 5 vegetable servings daily is appropriate.
Just to give you a "tidbit' - 1 pound of carrots has 3 teaspoons of sugar BUT the sugarin this case does enter your bloodstream a bit quickly, meaning it has a high glycemic load. On the other hand, since it is only 3 teaspoons of sugar - the glycemic load which factors speed of sugar entry and how much sugar is actually low.
When it comes to fruit ane veggies - the natural sugar is tempered by fiber -
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