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.
Other possible causes of constipation include: 1  a bowel obstruction. 2  bowel disease, such as irritable bowel syndrome. 3  an anal fissure.  colon 1  cancer. rectal cancer.  abdominal cancer that puts pressure on your digestive system.