Final answer:
Lactose intolerance is caused by Lactase Deficiency, which leads to an inability to digest lactose found in milk, causing symptoms like bloating and diarrhea. Dietary changes and lactase supplements are common treatments.
Step-by-step explanation:
Lactose intolerance is caused by B. Lactase Deficiency. This condition happens when the absorptive cells of the small intestine do not produce sufficient amounts of lactase, the enzyme necessary for digesting lactose, which is the sugar found in milk. Without enough lactase, the body cannot break down lactose, leading to symptoms such as bloating, diarrhea, and abdominal cramps. In some populations, including many Asians, lactase production can decline with age, resulting in increased incidences of lactose intolerance. Conversely, others, particularly many Caucasians, retain the ability to produce lactase into adulthood.