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.
Conditions of the gastrointestinal tract that cause black stool. Black stool can be due to a variety of serious or life-threatening conditions that result in bleeding of the gastrointestinal tract including: Abdominal or esophageal trauma. Abnormal blood vessel. Bleeding esophageal varices (abnormally widened or distended blood vessels in the esophagus that rupture)