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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.
Darker than normal stools caused by iron in prenatal vitamins do not cause problems during pregnancy. In fact, darker than normal stools indicate that your body is absorbing the iron; this is actually a positive sign of good absorption. Coated or long-acting pills tend to cause the most problems with dark stools.