Any food that you ingest is processed and metabolized by the body. Food is broken down into the various building blocks the body needs, and what cannot be metabolized or used is processed and removed by the liver. Protein and fats are used for muscle and tissue regeneration and other processes in the body. Carbohydrates are typically a fast fuel for the body, but when more are eaten that the body immediately needs, they must be stored. A simple explanation from a previous post:
In a person with carbohydrate intolerance, type 2 diabetes or prediabetes, this system breaks down. The body loses its insulin sensitivity and more and more insulin is required to remove the excess blood sugar. As a result, blood sugar levels remain high and insulin levels are high as well, and these high insulin levels can make your body even less sensitive to insulin.

Effect of an 8-week very-low-calorie diet in type 2 diabetes on arginine-induced maximal insulin secretion (A), first phase insulin response to a 2.8 mmol/L increase in plasma glucose (B), and pancreas triacylglycerol (TG) content (C). For comparison, data for a matched nondiabetic control group are shown as ○. Replotted with permission from Lim et al. (21).
“Decreasing caloric intake for any reason brings with it a rapid improvement in glucose control,” said Dr. Robert Lash, the chairman of the Endocrine Society’s clinical affairs committee and a professor of internal medicine at the University of Michigan. “What’s exciting here is that the improvements in glucose control persisted when the participants went back to eating a diet with a normal number of calories.”
Each day in the United States, some 18 million people with diabetes walk a tightrope between too little sugar in the bloodstream and too much. Too little, which may come from a complication of medication, and they may quickly be overcome by dizziness, fatigue, headache, sweating, trembling, and, in severe cases, loss of consciousness and coma. Too much, which can happen after eating too much, especially if the person is older and overweight, and the person may experience weakness, fatigue, excessive thirst, labored breathing, and loss of consciousness.

“Basic principles of good health like eating right, exercising regularly, and maintaining a healthy weight can be as effective as medicine in the management of type 2 diabetes for most people,” says Sue McLaughlin, RD, CDE, lead medical nutrition therapist at Nebraska Medicine in Omaha. That's backed up by the Look AHEAD study, a large clinical trial funded by the National Institutes of Health and the Centers for Disease Control and Prevention (CDC). The researchers found that over a four-year period, changes like eating a healthier diet and getting more exercise led to weight loss and improved diabetes control in 5,000 overweight or obese participants with type 2 diabetes.
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Gene therapy can be used to turn duodenum cells and duodenum adult stem cells into beta cells which produce insulin and amylin naturally. By delivering beta cell DNA to the intestine cells in the duodenum, a few intestine cells will turn into beta cells, and subsequently adult stem cells will develop into beta cells. This makes the supply of beta cells in the duodenum self replenishing, and the beta cells will produce insulin in proportional response to carbohydrates consumed.[78]
In Type 2 diabetes, the insulin that is produced does not work effectively. This is referred to as “insulin resistance.” Previously referred to as “adult-onset diabetes,” Type 2 diabetes is the most common form and occurs most frequently in inactive, overweight adults. With rising rates of childhood obesity, we are now seeing Type 2 diabetes diagnosed in more children and teens. Type 2 diabetes is usually treated with a diet that promotes weight loss, exercise and oral medications. Over time, most with Type 2 diabetes produce less insulin. Because of this,insulin may also be required to treat Type 2 diabetes. 
Low blood sugar, or hypoglycemia, is a syndrome in which a person's blood sugar is dangerously low. People with type 1 and type 2 diabetes are at risk for this condition. There are other diseases that can cause a person's blood sugar levels to go too low, for example, pancreatitis, Cushing's syndrome, and pancreatic cancer. Symptoms and signs that your blood sugar levels are too low include:
Drugs of this class decrease the absorption of carbohydrates from the intestine. Before being absorbed into the bloodstream, enzymes in the small intestine must break down carbohydrates into smaller sugar particles, such as glucose. One of the enzymes involved in breaking down carbohydrates is called alpha-glucosidase. By inhibiting this enzyme, carbohydrates are not broken down as efficiently, and glucose absorption is delayed.
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