There are a number of rare cases of diabetes that arise due to an abnormality in a single gene (known as monogenic forms of diabetes or "other specific types of diabetes").[10][13] These include maturity onset diabetes of the young (MODY), Donohue syndrome, and Rabson–Mendenhall syndrome, among others.[10] Maturity onset diabetes of the young constitute 1–5% of all cases of diabetes in young people.[39]
Though not routinely used any longer, the oral glucose tolerance test (OGTT) is a gold standard for making the diagnosis of type 2 diabetes. It is still commonly used for diagnosing gestational diabetes and in conditions of pre-diabetes, such as polycystic ovary syndrome. With an oral glucose tolerance test, the person fasts overnight (at least eight but not more than 16 hours). Then first, the fasting plasma glucose is tested. After this test, the person receives an oral dose (75 grams) of glucose. There are several methods employed by obstetricians to do this test, but the one described here is standard. Usually, the glucose is in a sweet-tasting liquid that the person drinks. Blood samples are taken at specific intervals to measure the blood glucose.
Hyperglycemia or high blood sugar is a serious health problem for diabetics. There are two types of hyperglycemia, 1) fasting, and 2)postprandial or after meal hyperglycemia. Hyperglycemia can also lead to ketoacidosis or hyperglycemic hyperosmolar nonketotic syndrome (HHNS). There are a variety of causes of hyperglycemia in people with diabetes. Symptoms of high blood sugar may include increased thirst, headaches, blurred vision, and frequent urination.Treatment can be achieved through lifestyle changes or medications changes. Carefully monitoring blood glucose levels is key to prevention.

Type 2 diabetes is due to insufficient insulin production from beta cells in the setting of insulin resistance.[13] Insulin resistance, which is the inability of cells to respond adequately to normal levels of insulin, occurs primarily within the muscles, liver, and fat tissue.[45] In the liver, insulin normally suppresses glucose release. However, in the setting of insulin resistance, the liver inappropriately releases glucose into the blood.[10] The proportion of insulin resistance versus beta cell dysfunction differs among individuals, with some having primarily insulin resistance and only a minor defect in insulin secretion and others with slight insulin resistance and primarily a lack of insulin secretion.[13]
Heart disease and stroke. People who have diabetes are at greater risk for heart disease and stroke. The risk is even greater for people who have diabetes and smoke, have high blood pressure, have a family history of heart disease, or are overweight. Heart disease is easiest to treat when it is caught early. It is very important to see your doctor on a regular basis. He or she can test for early signs of heart disease. This includes checking cholesterol levels. If your cholesterol is higher than the recommended level, your doctor will talk to you about lifestyle changes and medicine to help get your cholesterol under control.

Diabetes also can cause long-term complications in some people, including heart disease, stroke, vision impairment, and kidney damage. It also can cause other problems throughout the body in the blood vessels, nerves, and gums. While these problems don't usually show up in kids or teens who've had type 1 diabetes for only a few years, they can affect them in adulthood, particularly if their diabetes isn't well controlled.
When Dan Hamilton was diagnosed with T1D in 1972, the doctor told him he wouldn’t live past 50. Fast forward 45 years, and Dan is strong and healthy at 59. He credits his health to the advancements in treatment and care over the years. He has been an early adopter of every technology that has come along, and exercises regularly as part of a healthy lifestyle.
A second oral agent of another class or insulin may be added if metformin is not sufficient after three months.[78] Other classes of medications include: sulfonylureas, thiazolidinediones, dipeptidyl peptidase-4 inhibitors, SGLT2 inhibitors, and glucagon-like peptide-1 analogs.[78] As of 2015 there was no significant difference between these agents.[78] A 2018 review found that SGLT2 inhibitors may be better than glucagon-like peptide-1 analogs or dipeptidyl peptidase-4 inhibitors.[94]
With type 2 diabetes, your body doesn’t use insulin well and can’t keep blood sugar at normal levels. About 90% of people with diabetes have type 2. It develops over many years and is usually diagnosed in adults (but more and more in children, teens, and young adults). You may not notice any symptoms, so it’s important to get your blood sugar tested if you’re at risk. Type 2 diabetes can be prevented or delayed with healthy lifestyle changes, such as losing weight, eating healthy food, and being active.
In 2017, 425 million people had diabetes worldwide,[8] up from an estimated 382 million people in 2013[17] and from 108 million in 1980.[101] Accounting for the shifting age structure of the global population, the prevalence of diabetes is 8.8% among adults, nearly double the rate of 4.7% in 1980.[8] [101] Type 2 makes up about 90% of the cases.[16][18] Some data indicate rates are roughly equal in women and men,[18] but male excess in diabetes has been found in many populations with higher type 2 incidence, possibly due to sex-related differences in insulin sensitivity, consequences of obesity and regional body fat deposition, and other contributing factors such as high blood pressure, tobacco smoking, and alcohol intake.[102][103]
A lot of diabetes apps are geared toward helping people with diabetes cook the best food for managing their condition. While not geared exclusively at people with diabetes, HealthyOut is about helping people eat at and order from restaurants while maintaining a diabetic-friendly diet. The user searches local restaurants with filters like "Low Carb," "Low Fat," and, their most popular filter, "Not a salad." According to the company, HealthyOut dishes have half the calories and half the fat compared to the average restaurant meal.

Lifestyle factors are important to the development of type 2 diabetes, including obesity and being overweight (defined by a body mass index of greater than 25), lack of physical activity, poor diet, stress, and urbanization.[10][31] Excess body fat is associated with 30% of cases in those of Chinese and Japanese descent, 60–80% of cases in those of European and African descent, and 100% of cases in Pima Indians and Pacific Islanders.[13] Among those who are not obese, a high waist–hip ratio is often present.[13] Smoking appears to increase the risk of type 2 diabetes mellitus.[32]

Diabetes was one of the first diseases described,[107] with an Egyptian manuscript from c. 1500 BCE mentioning "too great emptying of the urine."[108] The Ebers papyrus includes a recommendation for a drink to take in such cases.[109] The first described cases are believed to have been type 1 diabetes.[108] Indian physicians around the same time identified the disease and classified it as madhumeha or "honey urine", noting the urine would attract ants.[108][109]
Your doctor may recommend working with a registered dietitian and a personal trainer to help you set up a diabetes weight loss plan. "Diet and exercise is always encouraged as the first line of therapy, but it works better for some people than others," says Sullivan. If you’re obese and having trouble losing weight with diet and exercise alone, your doctor may recommend medications to suppress your appetite and promote weight loss, or even gastric bypass surgery.ause of nontraumatic blindness and kidney failure.[24] It has also been associated with an increased risk of cognitive dysfunction and dementia through disease processes such as Alzheimer's disease and vascular dementia.[25] Other complications include acanthosis nigricans, sexual dysfunction, and frequent infections.[23]
Onset of type 2 diabetes can be delayed or prevented through proper nutrition and regular exercise.[61][62][needs update] Intensive lifestyle measures may reduce the risk by over half.[24][63] The benefit of exercise occurs regardless of the person's initial weight or subsequent weight loss.[64] High levels of physical activity reduce the risk of diabetes by about 28%.[65] Evidence for the benefit of dietary changes alone, however, is limited,[66] with some evidence for a diet high in green leafy vegetables[67] and some for limiting the intake of sugary drinks.[33] There is an association between higher intake of sugar-sweetened fruit juice and diabetes but no evidence of an association with 100% fruit juice.[68] A 2019 review found evidence of benefit from dietary fiber.[69]

Diabetes is a disease that occurs when your blood glucose, also called blood sugar, is too high. Blood glucose is your main source of energy and comes from the food you eat. Insulin, a hormone made by the pancreas, helps glucose from food get into your cells to be used for energy. Sometimes your body doesn’t make enough—or any—insulin or doesn’t use insulin well. Glucose then stays in your blood and doesn’t reach your cells.