Hello @januaryjane, You will notice I changed your discussion title to better describe your question. Not that long ago I was having issues with some off color stools and did find a page with a funny title that really put it all in easy to understand layman's terms. The document from UMass says a green stool may indicate too much bile is present. Food may be moving through your body too quickly, not giving bile the time that it needs to break down.

Oh, Poop. Everything you need to know about your #2 -- https://www.umassmemorialhealthcare.org/sites/umass-memorial-hospital/files/Documents/Services/Surgery/UMass_Colorectal_Inforgraphic_0316.pdf

Have you had a chance to ask your primary care doctor about what may be the cause?