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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.
1 Black stool may be from blackberries, blueberries, iron in red meat, spinach, iron supplements or Pepto-Bismol. 2  Other causes of black bowel movement. 3  Red stool may be from beets, artificial colors in drinks, sweets, or ice creams, red gelatin, tomato juice or soup.olor of a normal bowel movement in most people is any shade of brown, including light brown (described as yellow by some), but this is not the same as bright yellow) . The following stool colors may be also normal, if they result from ingested substances: