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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.
Several possibilitie: Stool can be dark from iron pills pepto bismol (bismuth subsalicylate) or foods like spinach. Black tarry stools may indicate bleeding from the stomach area and should be checked right away. ...Read more.