Healthy blood sugar levels following a meal are less than 140 milligrams per deciliter for people age 50 and younger and 150 milligrams per deciliter for people ages 50 to 60, according to WebMD. For people age 60 and older, healthy levels are less than 160 milligrams per deciliter.
A blood glucose test is used to determine the amount of glucose in a person’s blood, notes WebMD. Glucose levels tend to be slightly elevated following a meal, and testing about two hours after a meal can determine whether someone with diabetes is taking the proper amount of insulin. Normal values, called a reference range, can vary depending on whether the test was taken following a meal, after fasting or randomly.