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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.
Green is not uncommon and may be the result of too much or too little bile or food moving through the intestines too fast. Diet can also effect stool color. Green vegetables, such as spinach and broccoli can cause green stool, and foods containing green food coloring can yield the same result. Just as often though, other food colors can have the same impact. Purple drinks are a particular culprit, especially in young children. Some dietary supplements, especially iron, can also cause green stool.