Why should I eat about the same amount at the same times each day to contol my diabetes?

Your blood glucose goes up after you eat. If you eat a big lunch one day and a small lunch the next day, your blood glucose levels will change too much.

Keep your blood glucose at a healthy level by eating about the same amount of carbohydrate foods at about the same times each day. Carbohydrate foods, also called carbs, provide glucose for energy. Starches, fruits, milk, starchy vegetables such as corn, and sweets are all carbohydrate foods.

Talk with your doctor or diabetes teacher about how many meals and snacks to eat each day. Print out these clock faces and draw hands on the clocks to show when to have your meals and, if necessary, snacks.

source: http://diabetes.niddk.nih.gov/dm/pubs/eating_ez/index.htm