I remember some second grader told me his "poop went green" after "taste-testing" some blue fingerpaint with a 'little' yellow on the side ().
He even wanted to show his disgusting green excrement, but I was occupied with my lunch at the time.
Every time I look back at that, I remind myself that even second graders can be trying out some much more dangerous substances (.. .. ... i.e., drugs).
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So unless you know the difference between pudding and fingerpaint,
My hypothesis for your case is that the green color was probably caused by some
**indigestible plant residue**.
You can experiment or test my hypothesis by eating or putting in your mouth today or tomorrow everything that you ate or put in your mouth on that day your stools went green
Edit: Be careful with fingerpaint. Thank goodness it's non-toxic!
Something with green food coloring? ...Or any food coloring (a green tint might have been mixed with other colors so it didn't look green when eating it).
Dave is more then likely right, bile. which is bright green as it mixes with our food. As it passes through us bacteria does its magic and breaks the bile salts down into simpler form which are darker in color.
The material that will be passed as stool normally undergoes a progressive color change from green to more yellow to brown. So green stool simply means that the mixture of food and digestive juices is passing through the large intestine faster than normal.