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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 dyes in foods such as licorice or foods colored with black food coloring can cause your stool to turn black. Other than food coloring or dyes, there is no other food-related reason why your stool would turn black. Black stool can indicate a serious condition, such as blood in your stool.