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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.
Food and Stool Color. Along with iron supplements, dark foods such as chocolate cookies and licorice can make stool appear black. If you haven't eaten black foods or taken iron supplements, your stool should not appear black -- even if you've eaten iron-rich foods such as eggs or shrimp. Spinach and other leafy greens may turn your stool dark green, which may appear black in dim lighting. Beets and tomato products may turn stool red, which can be difficult to distinguish from blood. Unexplainable black or red stool could signify a medical issue.