If the rapid changes in metabolism following bariatric surgery are a consequence of the sudden change in calorie balance, the defects in both insulin secretion and hepatic insulin sensitivity of type 2 diabetes should be correctable by change in diet alone. To test this hypothesis, a group of people with type 2 diabetes were studied before and during a 600 kcal/day diet (21). Within 7 days, liver fat decreased by 30%, becoming similar to that of the control group, and hepatic insulin sensitivity normalized (Fig. 2). The close association between liver fat content and hepatic glucose production had previously been established (20,22,23). Plasma glucose normalized by day 7 of the diet.
Suppose your friend is diagnosed with type 2 diabetes, then works hard to lose 50 pounds. He takes himself off all his medications and his blood sugars are now normal. What would you say to him? Probably something like “Great job. You’re really taking care of yourself. Keep it up!” What you wouldn’t say is something like “You’re such a dirty, filthy liar. My doctor says this is a chronic and progressive disease so you must be lying ”. It seems perfectly obvious that diabetes reversed because your friend lost all that weight. And that’s the point. The disease is reversible.
Jump up ^ Brown AF, Mangione CM, Saliba D, Sarkisian CA; Mangione; Saliba; Sarkisian; California Healthcare Foundation/American Geriatrics Society Panel on Improving Care for Elders with Diabetes (May 2003). "Guidelines for improving the care of the older person with diabetes mellitus". J Am Geriatr Soc. 51 (5 Suppl Guidelines): S265–80. doi:10.1046/j.1532-5415.51.5s.1.x. PMID 12694461.
“In the realm of fatty liver disease, which is highly associated with either prediabetes or fully diagnosed type 2 diabetes, we do know that decreased fat and decreased weight are associated with far better glucose control,” says Galati, who is the author of Eating Yourself Sick: How to Stop Obesity, Fatty Liver, and Diabetes From Killing You and Your Family. “This research reinforces the idea that patients with type 2 diabetes who are obese — which is the vast majority — can improve their blood sugar control as well as their long-term outlook with weight loss.”
A useful test that has usually been done in a laboratory is the measurement of blood HbA1c levels. This is the ratio of glycated hemoglobin in relation to the total hemoglobin. Persistent raised plasma glucose levels cause the proportion of these molecules to go up. This is a test that measures the average amount of diabetic control over a period originally thought to be about 3 months (the average red blood cell lifetime), but more recently[when?] thought to be more strongly weighted to the most recent 2 to 4 weeks. In the non-diabetic, the HbA1c level ranges from 4.0–6.0%; patients with diabetes mellitus who manage to keep their HbA1c level below 6.5% are considered to have good glycemic control. The HbA1c test is not appropriate if there has been changes to diet or treatment within shorter time periods than 6 weeks or there is disturbance of red cell aging (e.g. recent bleeding or hemolytic anemia) or a hemoglobinopathy (e.g. sickle cell disease). In such cases the alternative Fructosamine test is used to indicate average control in the preceding 2 to 3 weeks.

Diabetic patients must get professional dental cleanings every six months. In cases when dental surgery is needed, it is necessary to take some special precautions such as adjusting diabetes medication or taking antibiotics to prevent infection. Looking for early signs of gum disease (redness, swelling, bleeding gums) and informing the dentist about them is also helpful in preventing further complications. Quitting smoking is recommended to avoid serious diabetes complications and oral diseases.

Like the sulfonylureas, meglitinides is a class of drugs that work by promoting insulin secretion from the pancreas. Unlike the sulfonylureas, which last longer in the body, repaglinide (Prandin) and nateglinide (Starlix) are very short acting, with peak effects within one hour. For this reason, they are given up to three times a day just before meals.