Human Digestive Tract and Transit Time

Maybe a strange topic, but green stools is an indication of abnormally short transit time as bile starts out green, then turns darker and darker as it transits the intestinal tract; hence, if stools are green that means it hasn't been through all the processes and may be an indication of malabsorbtion or other serious problems.

Green eggs and ham may be another story as it may be caused by the green dye; same with other things using green dye such as cake frosting, etc.

Here is an interesting chart of transit time.