Before a 2-hour OGTT, carbohydrate intake should be at least what amount for 3 days?

• A. Less than 50 g/day
• B. 150 g/day or more
• C. 300 g/day
• D. No restriction

Answer: (B)

Before a 2-hour OGTT, you want the body’s glucose handling to reflect normal physiology, not the effects of a restricted diet. To achieve this, carbohydrate intake should be kept at a normal level for several days prior to the test. The standard guidance is to consume at least 150 g of carbohydrate per day for three days before the test. Eating far less than that (very low-carb) can deplete glycogen stores and alter glucose metabolism, potentially skewing the results, whereas meeting the minimum ensures a typical metabolic state. Remember, the test also involves an overnight fast before the glucose load is given and the 2-hour measurement is taken.