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Spinach is high in iron and this may cause stools to appear black. However, in my experience, I have another explanation. I juice a lot of spinach, enough to sometimes make an 8 ounce glass of juiced produce, that includes fruits, green (unless I add some beet). Drinking all that deep green from the spinach can have a striking effect on the color of your stools. One day I noticed my BMs were nearly blackânot like the color of coal, but near black enough to grab my attention. I had ingested a larger-than-usual amount of spinach.
Blueberries can/will cause black stool. I wouldn't worry about this one, your fine. iron supplements, Pepto-Bismol, Black licorice, and chocolate can also cause a person to have black stool (there are other things that can/will cause your stool to be black, but I can't think of them right now).