The sugar is made in the leaves but transported to and stored in the stem, root, or fruit.
The sugar content of green vegetables is very low, and it’s mixed in with a lot of other stuff like fiber.
The sugar content of some root vegetables, like carrots, is considerably higher.
The sugar content of fruit is much higher yet.
In fruit juice it’s even higher, because it’s been concentrated, and much of the other stuff that buffers the sugar is removed.
Confections, candy, syrups, etc, are made with concentrated and purified sugar so their content is extremely high and very accessible, and soft drinks are pretty much just sugar water.
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