How fast will 31 grams of carbs in a banana bring up low blood sugar 38?

It is not possible to determine the exact rate at which 31 grams of carbs in a banana will bring up low blood sugar of 38. The rate at which blood sugar levels rise after consuming carbohydrates depends on several factors, including the individual's insulin sensitivity, the type and amount of carbohydrates consumed, and the presence of other foods in the meal.

If you have low blood sugar, it is essential to follow the advice of your doctor or a registered dietitian to manage your blood sugar levels safely and effectively.