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Diabetes
Types, Diagnosis & Treatment

Definition:
Diabetes mellitus is a medical disorder characterized by varying or persistent hyperglycemia (elevated blood sugar levels), especially after eating.
Hypoglycemia (low blood sugar) is rare except as a side effect of treatment (usually misapplication of medication in particular circumstances).

Historically, physicians have focused on two factors that are characteristic of diabetes mellitus:
1- Decreased production of insulin (the first recognized basis),
or
2- Decreased sensitivity of body tissues to insulin (the more common),
or
3- A combination of both.
The distinction between these two circumstances remains important.

Types of Diabetes:
While there are different types of diabetes mellitus, most are asymptomatic for a (variable) time after onset, but all share similar symptomatology and complications at advanced stages. This disease involves multiple casual factors and clinical aspects, all of which should be well understood for better management.
Patient understanding and participation is highly desired as blood glucose levels change continuously in response to exercise, diet, physical and psychological stress, infection, accident (i.e., trauma), hormonal changes, and even (perhaps) phase of the moon; the diabetic patient is the only person present or experiencing all of these.

Hyperglycemia itself can lead to :
Dehydration and ketoacidosis
Longer-term complications include cardiovascular disease (doubled risk - equal rates to those with heart attacks) from
    advanced atherosclerotic disease.
Renal failure (worldwide, diabetes mellitus is the most common cause of chronic renal failure requiring renal dialysis)
Retinal damage with eventual blindness
Nerve damage and eventual gangrene with probable loss of toes, feet, and even legs.

Conversely, successfully keeping blood sugar normal at all times, despite the difficulty of doing so (especially 0.5 to about 4 hours after eating) has been compellingly shown to reduce/prevent each of these problems.

Other factors that can, and should, be controlled to reduce problems associated with diabetes include:
Not smoking
Optimizing lipoprotein cholesterol patterns, reducing body fat
Exercising regularly, preferably with increasing intensity (Pima Indians often cease to be diabetic after becoming long
    distance runners)

Statistics:
In 2004, according to the World Health Organization, more than 150 million people worldwide suffer from diabetes. Its incidence is increasing rapidly, and it is estimated that by the year 2025 this number will double.
Diabetes mellitus occurs throughout the world, but is more common (especially Type 2) in the more developed countries.

WHO criteria - sampling & screening procedures:

Arabian Countries

In the Arabian country, the inidious onset of type 2 Diabetes is often poorly defined, so the preferred statistics gone through "Epidemiologic methodology" which is the percentage of diseased persons in a population sample at a given time.

In most cases in the present Arab investigations simple cluster samples or simple random samples of households was chosen. In other cases (Saudi , Egypt) multistage, stratified cluster, random sampling techniques were used to ensure accurate representation.

Causes and types of diabetes mellitus:
The role of insulin Since insulin is the principal hormone that makes it possible for many cells (primarily muscle and fat cells) to use glucose from the blood, deficiency of insulin or its action plays a central role in all forms of diabetes.
Most of the carbohydrates in food are rapidly digested to glucose, the principal sugar in blood. Insulin is produced by beta cells in the pancreas in response to rising levels of glucose in the blood, as occurs after a meal. Insulin makes it possible for most body tissues to remove glucose from the blood for use as fuel, for conversion to other needed molecules, or for storage. Insulin is also the principal control signal for conversion of glucose, the basic sugar unit, to glycogen for storage in liver and muscle cells. Lowered insulin levels result in the reverse conversion of glycogen to glucose when glucose levels fall -- though only in the liver not muscle tissue. Higher insulin level increase many anabolic ("building up") processes such as cell growth, cellular protein synthesis, and fat storage. Insulin is the principal signal in converting many of the bidirectional processes of metabolism from a catabolic to an anabolic direction. if the amount of insulin produced is insufficient, if cells respond poorly to the effects of insulin (resistance or insulin insensitivity), or if the insulin itself is defective, glucose is not handled properly by body cells (about 2/3 require it) nor stored appropriately in the liver and muscles. The net effect is persistent high levels of blood glucose, poor protein synthesis, and other metabolic derangements.

Type 1 diabetes mellitus:
Formerly, Type 1 diabetes was called "childhood" or "juvenile" diabetes or "insulin dependent" diabetes.
Each term is a misnomer, most especially since the obesity epidemic in recent years has led to increased incidence of Type 2 diabetes in children and adolescents and insulin is used in some Type 2 cases.

Type 1 diabetes is most commonly diagnosed in children and adolescents, but can occur in adults as well. It is an
    autoimmune disorder, in which the body's own immune system attacks the beta cells in the Islets of Langerhans of the
    pancreas, destroying them or damaging them sufficiently to reduce insulin production. The autoimmune attack may be
    triggered by reaction to an infection, for example by one of the viruses of the Coxsackie virus family.
A subtype of Type 1 (identifiable by the presence of antibodies against beta cells) develops slowly and so is often confused
    with Type 2.
In addition, a small proportion of Type 1 cases has the hereditary maturity onset diabetes of the young (MODY).

Artificial Type 1 Diabetes:
Some poisons (e.g., a type of rat poison) work by selectively destroying certain types of cells, including pancreatic beta cells,
    thus producing 'artificial' Type 1 diabetes.
Other pancreatic problems including trauma or tumor (either malignant or benign) can also lead to loss of insulin production
    and Type 1.

Treatment of Type 1 D.M.:
Currently, Type 1 is treated with insulin injections, lifestyle adjustments, and careful monitoring of blood glucose levels using
    blood test kits. The treatment must be continued indefinitely.
Experimental replacement of beta cells (by transplant) is being investigated in several research programs and may become
    clinically available in future. About 5-10% of all North American cases of diabetes are Type 1 diabetics. The fraction of Type
    1 diabetics in other parts of the world differs; this is likely due to both differences in the rate of Type 1 and differences in the
    rate of other Types, most prominently Type 2. Most of this difference is not currently understood.

Type 2 diabetes mellitus:
Type 2 diabetes was formerly known by a variety of partially misleading names, including "adult-onset diabetes", "obesity-related diabetes", "insulin-resistant diabetes", or "non-insulin-dependent diabetes" (NIDDM).

Type 2 diabetes is characterized by "insulin resistance" as body cells do not respond appropriately when insulin is present. This is a more complex problem than type 1, but is sometimes easier to treat, since insulin is still produced in many, especially in the initial years.

Type 2 may go unnoticed for years in a patient before diagnosis, since the symptoms are typically milder (no ketoacidosis) and can be sporadic. However, severe complications can result from unnoticed Type 2 diabetes, including hypertension, renal failure, and coronary artery disease.

It may be caused by a number of diseases, such as hemochromatosis and polycystic ovary syndrome, and can also be caused by certain types of medications (e.g., long-term steroid use).

Type 2 Diabetes in the Arab World is the subject of the present essay, which gives update of the present rate and where possible, a historic perspective. It takes a look at Obeisty and sedentary life-style, two common risk factors for Diabetes.

The fraction of Type 2 diabetics in other parts of the world varies substantially, almost certainly for environmental reasons.

There is also a very strong inheritable genetic connection in type 2 diabetes - having relatives, especially close ones, with type 2 is a considerable risk factor for developing type 2 diabetes. Most patients with type 2 diabetes mellitus are obese - chronic obesity leads to increased insulin resistance that can develop into diabetes, most likely because fat tissue is a (recently identified) source of chemical signals (ie, hormones).

Treatment of Type 2 D.M.:
Type 2 is initially treated by changes in diet and through weight loss. This can restore insulin sensitivity, even when the
    weight lost is modest (e.g. 10-15 lbs or 5 kg).
The next step, if necessary, is treatment with oral antidiabetic drugs: the sulphonylureas, metformin, or (if these are
    insufficient thiazolidinediones).
When these have failed, insulin therapy may be necessary.

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