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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.
Iron tablets are a well-known cause of dark coloured stools and many expectant mothers notice this change when they take iron supplements during pregnancy. If a person were to eat a lot of black pudding or red meat this could also cause dark stools because of the rich iron content in those foods. I am not aware if chocolate can cause dark stools but have never had a patient bring that observation to my attention in clinical practice.