[Campbell Biology P.119] A person experiences bloating, gas, and abdominal cramps after cons... | Practice Question

A person experiences bloating, gas, and abdominal cramps after consuming milk. Based on the information provided, what is the most likely reason for these symptoms, and what common solution is suggested?

  • A: The person has an allergy to milk proteins; they should consume lactose-free milk.
  • B: The person lacks the enzyme lactase, leading to undigested lactose being broken down by intestinal bacteria; taking lactase enzyme supplements before dairy consumption could help.
  • C: The person has a sensitivity to milk fats; they should opt for skim milk.
  • D: The person's body produces too much lactase, causing rapid sugar breakdown; consuming fermented dairy products would balance it.

Explanation

The text explicitly states that 'Lactose intolerance is a common condition in humans who lack lactase, the enzyme that breaks down lactose. The sugar is instead broken down by intestinal bacteria, causing formation of gas and subsequent cramping. The problem may be avoided by taking the enzyme lactase'.