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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.
Causes of Dark Green Stool. Excessive intake of leafy vegetables, iron or dyes: an excessive amount of leafy green vegetables in the diet can cause the stool to turn a dark green color. Spinach, lettuce, broccoli or even peas can cause discoloration in the stool. This is not a dangerous condition, but rather this is a sign that your body is taking in more nutrients than it can use. Consuming iron supplements can have a similar effect on the body.