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.
Lack of water and fibre in the body causes constipation along with other problems. There are many other reasons too for constipation but these are the main underlying causes. Other than these, lifestyle, stress, irregular time of bowel movements, diet, other diseases also contribute to constipation.