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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.
Black Stools (Not Sticky, No Odor) Causes of black stool include iron pills or bismuth-containing medications (such as, bismuth subsalicylate or Pepto-Bismol). If the stool color is dark because of any of these medications, it is typically not sticky in texture and is not foul-smelling. Black Tarry, Sticky Stools. Bleeding in the stomach (from gastritis or an ulcer) or the intestines can change the color of stool.