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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.
Not only does one cup of cooked spinach pack 4 grams of fiber, but it's also an excellent source of magnesium. The mineral helps the colon contract and also helps draw water in to flush things through, says Dr. Blaney. In fact, in some cases, she'll give patients a laxative with magnesium in it.