Green stool may be a normal condition, such as in infants, or it may be a sign of intestinal disorders. Normally, bile, which is yellow-green in color, is secreted to help digest the food, and as stool transits through the digestive tract, it gradually changes color into brown because of the normal digestive mechanisms. Infections that cause diarrhea, such as Salmonella food poisoning, cause the stool to pass through the intestines quickly, not giving it enough time to turn brown, and thus the appearance of green stool. Stool may also be green due to medication use, such as iron supplements, antibiotics, or laxatives, or due to ingestion of foods with green food coloring. For a more extensive list of the possible causes of green stool, you can visit here: http://www.bettermedicine.com/article/green-stool/causes
If your stools appears green it means that there may not be enough time to break down the bile and it passes more rapidly through intestines.Bile is a dark green to yellowish brown fluid, produced by the liver that aids the process of digestion of lipids in the small intestine. For more details please visit this site: http://www.medicinenet.com/stool_color/article.htm
Green stool can be caused by an excessive amount of iron, green vegetables or even purple Kool-Aid in your diet. Green is an indication that your digestive system did process your food as thoroughly because it went through the digestive tract too fast. Look here for more information: http://www.mayoclinic.com/health/stool-color/AN00772.
Green stool means a lot of things. If you have too much bile on the fecal matter, your stool would turn green. Infections are known to make the stool green in color. For details on the conditions that produce a green stool go to this site: http://stoolhealth.com/what-does-green-poop-mean/.