Fasting plasma glucose concentration depends entirely on the fasting rate of hepatic glucose production and, hence, on its sensitivity to suppression by insulin. Hepatic insulin sensitivity cannot be inferred from observed postprandial change in hepatic glycogen concentration because glucose transport into the hepatocyte is not rate limiting, unlike in muscle, and hyperglycemia itself drives the process of glycogen synthesis irrespective of insulin action. Indeed, postprandial glycogen storage in liver has been shown to be moderately impaired in type 2 diabetes (50) compared with the marked impairment in skeletal muscle (51).
In addition to giving you some ideas about what to eat, the plan also might recommend limiting foods that contain lots of fat or calories and that don't contain vitamins and minerals. Everyone who eats a healthy diet should limit these foods anyway, because eating too much of them can lead to too much weight gain or long-term health problems like heart disease.
Chronic exposure of β-cells to triacylglycerol or fatty acids either in vitro or in vivo decreases β-cell capacity to respond to an acute increase in glucose levels (57,58). This concept is far from new (59,60), but the observations of what happens during reversal of diabetes provide a new perspective. β-Cells avidly import fatty acids through the CD36 transporter (24,61) and respond to increased fatty acid supply by storing the excess as triacylglycerol (62). The cellular process of insulin secretion in response to an increase in glucose supply depends on ATP generation by glucose oxidation. However, in the context of an oversupply of fatty acids, such chronic nutrient surfeit prevents further increases in ATP production. Increased fatty acid availability inhibits both pyruvate cycling, which is normally increased during an acute increase in glucose availability, and pyruvate dehydrogenase activity, the major rate-limiting enzyme of glucose oxidation (63). Fatty acids have been shown to inhibit β-cell proliferation in vitro by induction of the cell cycle inhibitors p16 and p18, and this effect is magnified by increased glucose concentration (64). This antiproliferative effect is specifically prevented by small interfering RNA knockdown of the inhibitors. In the Zucker diabetic fatty rat, a genetic model of spontaneous type 2 diabetes, the onset of hyperglycemia is preceded by a rapid increase in pancreatic fat (58). It is particularly noteworthy that the onset of diabetes in this genetic model is completely preventable by restriction of food intake (65), illustrating the interaction between genetic susceptibility and environmental factors.
One of my patients, aged 58, had an initial hemoglobin A1c of 7.2%. She was taking oral hypoglycemic agents, statins, and proton pump inhibitors—the basic treatment for every diabetes diagnosis. The patient was 28 lbs overweight and worked long hours. She didn’t exercise, mostly ate a processed food diet, and was sleep deprived. The patient had a family history of diabetes, and ultimately her lifestyle expressed her genetic tendencies.
8. Amylin Mimetic This type of medication stimulates the release of insulin, and is used along with insulin injections. It may also help suppress hunger and promote weight loss. It’s less commonly used because it’s a shot administered in addition to insulin at each meal. Side effects can include low blood sugar, nausea, vomiting, headache, and redness and irritation at the injection site. Symlin (ramlintide) is what your doctor will prescribe you.
Diabetes is an illness related to elevated blood sugar levels. When you stop releasing and responding to normal amounts of insulin after eating foods with carbohydrates, sugar and fats, you have diabetes. Insulin, a hormone that’s broken down and transported to cells to be used as energy, is released by the pancreas to help with the storage of sugar and fats. But people with diabetes don’t respond to insulin properly, which causes high blood sugar levels and diabetes symptoms.
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.