Various types of potatoes. A staple food, or simply a staple, is a food that is eaten routinely and in such quantities that it constitutes a dominant portion of a standard diet for a given people, supplying a large fraction of energy needs and generally forming a significant proportion of the intake of other nutrients as well.
Constipation is defined medically as fewer than three stools per week and severe constipation as less than one stool per week. Constipation usually is caused by the slow movement of stool through the colon.
This can be caused by an excessive amount of the natural bacterial colonies in your digestive system, or exposure to dangerous bacteria such as Salmonella. Irritable bowel syndrome (IBS) can cause the stool to become a dark green color during an attack. Ulcerative colitis may cause a similar reaction.