A normal blood sugar level after eating is 140 milligrams per deciliter or less in healthy people, according to Merck. One to two hours after beginning a meal, diabetic patients should have a target blood sugar range of 180 milligrams per deciliter or less, according to the American Diabetes Association.
Ideal blood sugar, or glucose levels, are not the same for everyone. One person may have blood sugar in the range of 90 before a meal, while another person has blood sugar in the range of 60. Both are considered normal, according to WebMD. Low blood sugar is often caused by eating too little or later than normal, while high blood sugar is often caused by overeating or being less active than normal, according to Merck.