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.
According to the World Health Organization (WHO), global diabetes cases have increased from 108 million in 1980 to 422 million in 2014. Those numbers are expected to reach 642 million by 2040. According to data from the U.S. Centers for Disease Control and Prevention (CDC) reports, type 2 diabetes accounts for around 90 to 95 percent of cases in adults.
Q. I have Type 2 diabetes, and I currently take 1,000 milligrams (mg) of metformin twice a day, 5 mg of Onglyza (saxagliptin) once a day, and 5 mg of glipizide once a day. Does it matter when I take the Onglyza and the glipizide? I used to take them both at breakfast, but I thought I might get better blood-glucose-lowering coverage if I took one of them with lunch and one with dinner.
Trick (important): Cut down on sweets, and if you can, cut them out entirely for a couple months. I still eat ice cream about once a week, and know people who are losing weight on this diet while eating ice cream almost every day. But this probably won’t be the case for everyone. Better to severely restrict sweets for the first few months, and then gradually reintroduce.
You should have no more than three of these “feeding times” per day. The reason limiting the number and duration of your meal times is so important has to do with staying out of the vicious cycle of increasing insulin resistance. To get smart on insulin resistance — the cause of both type 2 diabetes and obesity — read Dr. Jason Fung’s book, The Obesity Code: Unlocking the Secrets of Weight Loss, or watch his free lecture on YouTube.