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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.
A reduction in bile salts due to liver disease, gall stones, and other conditions causes the stool to be pale. Dark stool can be due to dark foods, medications, or supplements, or may be due to digestive tract bleeding, which can result in red, maroon, or even black, tarry stool.