Diabetes is one of the diseases that involve problems with the hormone insulin. While not everyone with type2 diabetes is obese, obesity and lack of physical activity are two of the most common causes of this form of diabetes. It is also responsible for nearly 95% of diabetes cases in the United States, according to a research. 
We will give you a better perceptive of the causes of type 2 diabetes, what happens in the body when type2 diabetes occurs, and also about detailed health problems that increase your risk of type2 diabetes.
Diabetes is a serious disease that can cause incapacitating nerve pain.

In a healthy person, the pancreas (a hormonal organ at the back of the stomach) releases insulin to help your body store and use the sugar from the foodstuff you eat. Diabetes type1 ensues when one of the following occurs:

• When the pancreas does not generate any insulin.
• When the pancreas produces insufficient insulin.
• When the body does not counter appropriately to insulin, a condition called insulin resistance.

Unlike people with type 1 diabetes, people with type 2 diabetes produce insulin; however, the insulin their pancreas secretes is either not in an adequate amount or the body is unable to be acquainted with the insulin and use it properly. This is called insulin-resistance. When there isn't enough insulin or the insulin is not used as it should be, glucose (sugar) just does not get into the body's cells. When glucose builds up in the blood instead of going into cells, the body's cells become incapable to function appropriately.
To comprehend why insulin is important, we need to know more about how the body uses food for power. Our body is made up of millions of cells. To make energy, these cells need food in a very simple form. When we eat or drink, much of our food is broken down into a simple sugar called "glucose." Subsequently, glucose is transported through the bloodstream to the cells of our body where it can be used to provide the energy our body needs for daily activities.
The amount of glucose in our bloodstream is securely regulated by glucose hormone insulin. Insulin is always being released in small amounts by the pancreas. When the amount of glucose in our blood rises to a certain level, the pancreas starts releasing more insulin to push more glucose into the cells. This causes the glucose levels in our blood (blood glucose levels) to drop or rise subsequently.
To keep our blood glucose levels from getting too low (hypoglycaemia or low blood sugar), our body indicates us to eat more and releases some glucose from the provisions kept in the liver. People with diabetes either don't make insulin or their body's cells no longer are able to recognize insulin, leading to high blood sugars.
Type2 diabetes is believed to have a strong inherited link, in the sense that it tends to run in families. Several genes are being studied that may be related to the cause of type 2 diabetes. If you have any of the subsequent type2 diabetes threat factors, it’s imperative to ask your practitioner about a diabetes assessment. With an appropriate diabetes diet and healthy lifestyle habits, along with diabetes medication, if essential, you can manage your type2 diabetes just like you manage other vicinities of your life. Be sure to continue seeking the latest information, researches and data on type2 diabetes as you become your own health expert.
Other type2 diabetes risk factors include the following:

• High blood pressure
• High blood triglyceride (fat) levels
• Gestational diabetes or giving birth to a baby weighing more than 9 pounds
• High-fat diet
• High alcohol intake
• Deskbound lifestyle
• Obesity or being overweight
• Ethnicity: Certain groups, such as African Americans, Native Americans, Hispanic Americans, and Japanese Americans, have a greater risk of developing type 2 diabetes than non-Hispanic whites.
• Aging: Increasing age is a noteworthy risk factor for type 2 diabetes. The risk of budding type2 diabetes begins to rise significantly at about age 45 years, and rises considerably after age 65 years.
• Metabolic syndrome - a syndrome with 4 key features (diabetes, hypertension, obesity/overweight, and high cholesterol).
• Hemochromatosis - iron overload causes pancreas damage that can mimic Type 1 or Type 2 diabetes.
• Chronic pancreatitis - pancreas damage that can mimic diabetes.
• Polycystic ovary syndrome (PCOS) - ovary cysts inhibit natural female hormones causing insulin resistance
• Cystic fibrosis
• Maturity onset diabetes of the young
• Insulin receptor defect with insulin-resistant diabetes mellitus
• Haemochromatosis
• Maternally inherited diabetes and deafness - noninsulin-dependent diabetes mellitus.
• Cancer patients who have received Hematopoietic Cell Transplantation

Several lifestyle features are acknowledged to be imperative to the increase of type 2 diabetes. In one study, those who had high levels of physical activity, a nutritional diet, did not smoke, and consumed alcohol in moderation had a noticeable lower rate of diabetes. When a normal weight was included the rate was all the more lower. In this learning a healthy diet was defined as one high in fibre, with a high polyunsaturated to saturated fat ratio, and a lower mean glycaemia index. Obesity has been found to add to approximately 55% type2 diabetes, and decreasing consumption of saturated fats and transmitted fatty acids while replacing them with unsaturated fats may diminish the risk. The increased rate of childhood obesity in between the last few decades is believed to have led to the increase in type2 diabetes in children and adolescents.
Environmental toxins may contribute to recent increases in the rate of type2 diabetes. A positive correlation has been found between the concentration in the urine of bisphenol A, a constituent of some plastics, and the incidence of type2 diabetes.
There are many factors which can strongly give rise to or make worse the type 2 diabetes. These include obesity, hypertension, elevated cholesterol (combined hyperlipidemia), and with the condition often termed metabolic syndrome (it is also known as Syndrome X, Reavan's syndrome). Other causes include acromegaly, Cushing's syndrome, thyrotoxicosis, pheochromocytoma, chronic pancreatitis, cancer and drugs. Additional factors found to increase the risk of type 2 diabetes include aging, high-fat diets and a less active lifestyle.
Subclinical Cushing's syndrome (cortisol excess) may be associated with DM type 2. The percentage of subclinical Cushing's syndrome in the diabetic population is about 9%. Diabetic patients with a pituitary micro adenoma can improve insulin sensitivity by elimination of these micro adenomas.
Hypogonadism is often connected with cortisol excess, and testosterone insufficiency is also associated with diabetes mellitus type 2, even if the exact mechanism by which testosterone improve insulin sensitivity is still not known.
There is also a strong inheritable genetic connection in type2 diabetes: having relatives (especially first degree) with type 2 increases risks of developing type2 diabetes very substantially. In addition, there is also a mutation to the Islet Amyloid Polypeptide gene that results in an earlier onset, more severe, form of diabetes.
About 55 percent of type 2 patients are obese at diagnosis —chronic obesity leads to increased insulin resistance that can develop into Type 2, most likely because adipose tissue (especially that in the abdomen around internal organs) is a (recently identified) source of several chemical signals to other tissues (hormones and cytokines).
Other research shows that type 2 diabetes causes obesity as an effect of the changes in metabolism and other deranged cell behaviour attendant on insulin resistance.
However, environmental factors (almost certainly diet and weight) play a large part in the development of Type 2 in addition to any genetic component. This can be seen from the adoption of the Type 2 epidemiological pattern in those who have moved to a different environment as compared to the same genetic pool who have not. Immigrants to Western developed countries, for instance, as compared to lower incidence countries of origins.
There is a stronger inheritance pattern for type 2 diabetes. Those with first-degree relatives with type 2 have a much higher risk of developing type 2, increasing with the number of those relatives. Concordance among monozygotic twins is close to 100%, and about 25% of those with the disease have a family history of diabetes. Genes significantly associated with developing type 2 diabetes, include TCF7L2, PPARG, FTO, KCNJ11, NOTCH2, WFS1, CDKAL1, IGF2BP2, SLC30A8, JAZF1, and HHEX. KCNJ11 (potassium inwardly rectifying channel, subfamily J, member 11), encodes the islet ATP-sensitive potassium channel Kir6.2, and TCF7L2 (transcription factor 7–like 2) regulates proglucagon gene expression and thus the production of glucagon-like peptide-1. Moreover, obesity (which is an independent risk factor for type 2 diabetes) is strongly inherited.
Monogenic forms, e.g., MODY, constitute 1–5 % of all cases.
Various hereditary conditions may feature diabetes, for example myotonic dystrophy and Fried Reich’s ataxia. Wolfram's syndrome is an autosomal recessive neurodegenerative disorder that first becomes evident in childhood. It consists of diabetes insipidus, diabetes mellitus, optic atrophy, and deafness, hence the acronym DIDMOAD.
Gene expressions promoted by a diet of fat and glucose as well as high levels of inflammation related cytokines found in the obese results in cells that “produce fewer and smaller mitochondria than is normal,” and are thus prone to insulin resistance.

Pathophysiology of Type 2 Diabetes

Hyperglycaemia results from lack of endogenous insulin, which is either absolute, as in type 1 diabetes mellitus, or relative, as in type2 diabetes mellitus. Relative insulin deficiency usually occurs because of resistance to the actions of insulin in muscle, fat, and the liver and an insufficient reaction by the pancreatic beta cell. Insulin resistance, which has been attributed to elevated levels of free fatty acids in plasma,  leads to decreased glucose transport in muscle, elevated hepatic glucose production, and increased breakdown of fat.
The genetics of type2 diabetes are intricate and not completely understood, but most probably this disease is related to multiple genes (with the exception of maturity-onset diabetes of the young [MODY]). Confirmation supports hereditary components for pancreatic beta-cell failure and insulin resistance. Considerable debate exists regarding the primary defect in type2 diabetes mellitus. Most patients have insulin resistance and some degree of insulin deficiency. However, insulin resistance per se is not the sine qua non for type2 diabetes mellitus because many people with insulin resistance (particularly those who are obese) do not develop glucose intolerance. Therefore, insulin deficiency is necessary for the development of hyperglycaemia. Insulin concentrations may be high, yet inappropriately low for the level of glycaemia.
MODY is associated with autosomal dominant inheritance and is characterized by onset in at least 1 family member younger than 25 years, absence of autoantibodies, correction of fasting hyperglycaemia without insulin for at least 2 years, and absence of ketosis. At least 6 genetically different types of MODY have been described. Some patients ultimately require insulin to control glycaemia. Variants in 2 of the genes associated with MODY have been shown to predict future type2 diabetes.
Most probably, the defects of type 2 diabetes mellitus occur when a diabetogenic lifestyle (i.e., excessive caloric intake, inadequate caloric expenditure, obesity) is placed over upon a disposed genotype. The body mass index at which excess weight increases risk for diabetes varies with different racial groups. For example, compared with persons of European descent, persons of Asian descent are at increased risk for diabetes at lower levels of overweight.  In addition, and in environment resulting in low birth weight may predispose some individuals to develop type2 diabetes mellitus. Severe complications can result from improperly managed type 2 diabetes, including renal failure, erectile dysfunction, blindness, slow healing wounds (including surgical incisions), and arterial disease, including coronary artery disease.