Think about the foods you ate, any vitamins or supplements you took—even if they're not green in color. Foods that are rich in Iron as well.
Stool can also appear green for physical reasons, and not just from what you've been eating. We think of a healthy stool as being brown. Bile that is secreted in the first part of the small intestine is actually green. As stool is digested and passed through the large intestine it is turned into a darker brown color. If stool is still green by the time it is excreted, it could mean that it went through the large intestine too fast to be changed in color. This is often called "rapid transit" or "decreased colonic transit time" and diarrhea that is green in color could be the result.
If green stool continues, or your bowel habits have changed in other ways, you should call your doctor, especially true if lasting more than 2 days. This is especially true if you are experiencing diarrhea which can be an indication of other problems or could lead to dehydration.
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Healthcare Expert
17+ years, Healthcare Expert