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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.
Some people who have a spinach intolerance are able to eat small amounts of spinach or spinach that has been prepared in a particular way (cooked spinach or boiled spinach, for example) while other people will experience negative symptoms after eating even a small amount of any type of spinach.