A person could eat a meal including a large potatoe and
send their sugar through the roof. Eating
a lot of pasta or rice will do the same thing.
Because of my size, 5'6 and currently 169lbs down from 212lbs two years ago, I eat 45 good carbs per meal, three times a day, and 15 good carbs for a snack two to three times a day.
As a snack I eat a yogurt at 13carbs, or a Glucerna shake at 18carbs.