Well I’m not 100% sure, but I do know that watermelon is mostly water, and I also know that beetroot is used as dye in a lot of things.
Other than that, I can’t really tell you much
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It has to do with the pigments in the food. For beets, it is betalain, which survives the stomach acid and digestion process in most people where it is finally filtered out by the kidneys.
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