Which of the following is NOT a primary dietary risk factor for gallstones?

• A. High fat diet
• B. Vitamin C intake
• C. Low fiber
• D. Obesity

Answer: (B)

Understanding how diet influences gallstone formation centers on bile cholesterol saturation and how well the gallbladder empties. Obesity raises the cholesterol content of bile and can slow gallbladder emptying, both of which promote cholesterol stone formation. A high-fat diet similarly increases cholesterol in bile and is a recognized dietary risk factor, while a low-fiber diet can alter bile composition and gallbladder motility, also elevating risk. Vitamin C intake, on the other hand, isn’t regarded as a primary dietary driver of gallstones; it doesn’t have a clear, direct impact on bile cholesterol saturation or gallbladder function in the way the other factors do. So Vitamin C intake is not a primary dietary risk factor, making it the best answer.