Answer:  In recent years, intermittent fasting has emerged as a novel way of treating patients with type 2 diabetes. There are anecdotal reports of patients who have lost weight, their blood sugar levels have improved significantly, and they no longer need to take their diabetes medications. Their disease appears to be in remission – if not exactly cured.
However, the observation that normalization of glucose in type 2 diabetes occurred within days after bariatric surgery, before substantial weight loss (15), led to the widespread belief that surgery itself brought about specific changes mediated through incretin hormone secretion (16,17). This reasoning overlooked the major change that follows bariatric surgery: an acute, profound decrease in calorie intake. Typically, those undergoing bariatric surgery have a mean body weight of ∼150 kg (15) and would therefore require a daily calorie intake of ∼13.4 MJ/day (3,200 kcal/day) for weight maintenance (18). This intake decreases precipitously at the time of surgery. The sudden reversal of traffic into fat stores brings about a profound change in intracellular concentration of fat metabolites. It is known that under hypocaloric conditions, fat is mobilized first from the liver and other ectopic sites rather than from visceral or subcutaneous fat stores (19). This process has been studied in detail during more moderate calorie restriction in type 2 diabetes over 8 weeks (20). Fasting plasma glucose was shown to be improved because of an 81% decrease in liver fat content and normalization of hepatic insulin sensitivity with no change in the insulin resistance of muscle.
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The reason they need it: Their own insulin-producing islet cells, located in the pancreas, aren’t working. Now, scientists across the US are racing to develop effective ways to transplant new islet cells in people with diabetes—an alternative that could make daily life easier and lower risk for insulin side effects like dangerous low blood sugar episodes. 
Although a defect in mitochondrial function is associated with extremes of insulin resistance in skeletal muscle (30), this does not appear to be relevant to the etiology of type 2 diabetes. No defect is present in early type 2 diabetes but rather is directly related to ambient plasma glucose concentration (31). Observed rates of mitochondrial ATP production can be modified by increasing or decreasing plasma fatty acid concentration (32,33). Additionally, the onset of insulin stimulation of mitochondrial ATP synthesis is slow, gradually increasing over 2 h, and quite distinct from the acute onset of insulin’s metabolic effects (34). Although it remains possible that secondary mitochondrial effects of hyperglycemia and excess fatty acids exist, there is no evidence for a primary mitochondrial defect underlying type 2 diabetes.
A substantial proportion of people who experience type 2 diabetes remission after gastric bypass eventually have relapse of the disease down the road. I feel the best study of this was done by my co-author on CROSSROADS, David Arterburn. In a study of nearly 5,000 patients with diabetes who underwent [gastric bypass surgery] and were followed retrospectively for 13 years, about 70% experienced diabetes remission. Among these, about 1/3 eventually relapsed, but it’s important to note that the median disease-free interval was 8.3 years.

One of the lesser known herbs that lower blood sugar, Marjoram, is high in polyphenols, which aids in stabilizing blood glucose levels. A 2012 study in the Journal of Evidence Based Alternative and Complementary Medicine found that Marjoram reduced formation of Advanced Glycation End (AGE) products. AGE is the smoking gun that researchers today say is responsible for a lot of the complications that diabetics face, like damage to arteries and eyes. Try sprinkling marjoram on your dinner every night to help add variety in flavor. It can often be used as a substitute for oregano in cooking and brings in a distinct flavor to dishes.
What is prediabetes? Prediabetes is a condition where blood sugar levels are higher than normal, but not high enough to be diagnosed as type 2 diabetes. This occurs when the body has problems in processing glucose properly, and sugar starts to build up in the bloodstream instead of fueling cells in muscles and tissues. Insulin is the hormone that tells cells to take up glucose, and in prediabetes, people typically initially develop insulin resistance (where the body’s cells can’t respond to insulin as well), and over time (if no actions are taken to reverse the situation) the ability to produce sufficient insulin is reduced. People with prediabetes also commonly have high blood pressure as well as abnormal blood lipids (e.g. cholesterol). These often occur prior to the rise of blood glucose levels.
The above two rules are the only dietary rules you need to maintain ideal weight for the rest of your life, assuming you apply common sense and avoid extremes. The diet works by building in regular periods of insulin relief, keeping your body from becoming resistant to insulin. Following these two rules, you will maintain your weight and health by never entering the vicious cycle of increasing insulin resistance.