Introduction Diabetes Essay

Diabetes is a very big topic! To make the diagnosis, complications and treatment of diabetes more understandable, we have broken "diabetes" into several dozen diabetes topic pages which go into more and more detail. Our search engine will help you find specific diabetes information, or you can come back to this introduction page to see each of the diabetes topic pages listed.

Diabetes is a disorder characterized by hyperglycemia or elevated blood glucose (blood sugar). Our bodies function best at a certain level of sugar in the bloodstream. If the amount of sugar in our blood runs too high or too low, then we typically feel bad. Diabetes is the name of the condition where the blood sugar level consistently runs too high. Diabetes is the most common endocrine disorder. Sixteen million Americans have diabetes, yet many are not aware of it. African-Americans, Hispanics, and Native Americans have a higher rate of developing diabetes during their lifetime. Diabetes has potential long term complications that can affect the kidneys, eyes, heart, blood vessels, and nerves. A number of pages on this website are devoted to the prevention and treatment of the complications of diabetes.

Types of Diabetes

Although doctors and patients alike tend to group all patients with diabetes together, the truth is that there are two different types of diabetes which are similar in their elevated blood sugar, but different in many other ways. Throughout the remainder of these web pages we will be referring to the different types of diabetes when appropriate, but when the topic pertains to both types of diabetes we will use the general term "diabetes".

Diabetes is correctly divided into two major subgroups: type 1 diabetes and type 2 diabetes. This division is based upon whether the blood sugar problem is caused by insulin deficiency (type 1) or insulin resistance (type 2). Insulin deficiency means there is not enough insulin being made by the pancreas due to a malfunction of their insulin producing cells. Insulin resistance occurs when there is plenty of insulin made by the pancreas (it is functioning normally and making plenty of insulin), but the cells of the body are resistant to its action which results in the blood sugar being too high. 


Updated on: 04/26/16

Diabetes is a metabolic disorder that is characterized by high blood glucose and either insufficient or ineffective insulin.  5.9% of the population in the United States has diabetes, and diabetes is the seventh leading cause of death in our country.  Diabetes is a chronic disease without a cure, however, with proper management and treatment, diabetics can live a normal, healthy lives.


Insulin is a hormone secreted by specialized cells in the pancreas in response to (among other things), increased blood glucose concentration.  The primary role of insulin is to control the transport of glucose from the bloodstream into the cells.  After consuming a meal, insulin enhances the uptake of the energy nutrients (amino acids, glucose, and fatty acids).  Insulin helps maintain blood glucose within normal limits and stimulates protein synthesis, glucose synthesis in the liver and muscle, and fat synthesis. 

Without insulin, or when insulin is ineffective, glucose regulation falters and the metabolism of energy-yielding nutrients changes.  In diabetes, there is too much glucose in the blood.  When glucose builds in the blood instead of going into the cells, it can cause two problems:

  • Your cells may become starved for energy
  • Over time, high glucose blood levels may harm your kidneys, heart, eyes or nerves

There are two main types of diabetes, Type I and Type II, described below.

Type I Diabetes 
(a.k.a. Juvenile Onset Diabetes, Insulin-Dependant Diabetes)

Insulin-dependant is caused by damage to the pancreas.  The pancreas contains beta cells, which make insulin.  With Type I diabetes, the deficiency of insulin is due to a decline in the number of beta cells the pancreas contains.  It appears that certain genes make Type I diabetics more susceptible, but a triggering factor (usually a viral infection) sets it off.  In most people with Type I diabetes, the immune system makes a mistake, attacking the beta cells and causing them to die.  Without the beta cells, you cannot produce insulin.  Glucose then builds up in the blood and causes diabetes.

Type I diabetes exhibits the following warning signs:

  • Losing weight without trying
  • An increased need to urinate
  • Increased hunger
  • Increased thirst
  • Trouble seeing
  • Feeling tired and/or
  • Going into a coma

For Type I diabetics, treatment usually consists of a healthy diet, exercise, and insulin shots to replace the insulin that your body no longer produces.    Most insulin-dependent diabetics test their blood at least four times per day to monitor their blood’s glucose level. This is necessary to keep their blood glucose within certain limits.  If blood glucose is not monitored, and if insulin levels are not kept in check, three things may happen:

1.   Ketoacidosis – occurs when your blood glucose levels are highly elevated, by either eating too much or taking too little insulin, by stress or illness.  In this case, there is too little insulin in the blood.  Your body then begins breaking down fat for energy, producing chemicals called ketones.  Ketones can make you throw up, have difficulty breathing, cause excessive thirst, cause dry, itchy skin, or even cause coma.

2.   Hypoglycemia – occurs when blood glucose levels become too low.  It can be cause by taking too much insulin, eating too little, skipping meals, eating at the wrong time, exercising too intensely or for too long, or by drinking alcohol on an empty stomach.  If your blood glucose is too low you may feel hungry, confused, tired, shaky or nervous. 

3.   Complications – elevated glucose levels in the blood over time can hurt your organs.  Diabetes can damage kidneys, eyes and nerves, and makes heart and blood vessel disease more likely.  Diabetics can defend themselves from complications by keeping their glucose levels under control.

Type II Diabetes
(a.k.a. Adult Onset Diabetes, Non-Insulin-Dependent Diabetes)

Type II diabetes is the most common form of diabetes, with about 90% of diabetes falling into the Type II category.  With Type II diabetes, glucose builds up in the blood – not because not enough insulin is present, but probably because cells lose their insulin receptors and become less sensitive to insulin.  Type II  diabetes usually (though not always) occurs in individuals who are over 40 years of age who are overweight.

Type II diabetes produces mild symptoms, and can be controlled with a healthy diet, exercise and weight loss.  Type II diabetics should also monitor their glucose levels to be sure they are maintaining healthy levels.  In some cases, weight loss, diet and exercise are not enough to control the glucose levels.  In those cases, your physician may control your diabetes by prescribing diabetes pills or insulin shots.

Type II diabetes can cause three types of problems:

  1. High Blood Sugar – high glucose levels in the blood are most likely when you’re sick or under a lot of stress.  High blood sugar can cause you to have a headache, blurry vision, excessive thirst and an increased need to urinate, and cause dry, itchy skin.  Though less of a problem with Type II diabetes, ketones can build up in the blood when Type II diabetics have symptoms of high blood sugar, or when they are sick.
  2. Low Blood Sugar – When blood sugar falls to low you may feel tired, shaky, nervous, hungry or confused.  It may be caused by taking too much diabetes medicine, eating too little or skipping meals, exercising too intensely or for too long, or from drinking alcohol without eating. 
  3. Complications – Elevated blood glucose over many years can hurt organs, including the eyes, kidneys, and eyes.  It can also make heart and blood vessel disease more likely.  The best defense against complications is a careful monitoring of blood glucose, a healthy diet and exercise.

Risks for Diabetes

  • Individuals with parents or siblings with diabetes
  • People over the age of 45
  • People who are overweight
  • People who do not exercise regularly
  • People with low HDL cholesterol or high triglycerides
  • Certain racial and ethnic groups (African Americans, Latinos, Asians and Native Americans)
  • Women who had gestational diabetes or who had a baby weighing 9 pounds or more at birth.

Warning Signs of Diabetes

Type I:

  • Frequent urination
  • Unusual thirst
  • Extreme hunger
  • Unusual weight loss
  • Extreme fatigue
  • Irritability

*Type II:

  • Any of the Type I symptoms
  • Frequent infections
  • Blurred vision
  • Cuts/bruises that are slow to heal
  • Tingling/numbness in the hands or feet
  • Recurring skin, gum or bladder infections


*individuals with Type II diabetes often have no symptoms

For More Information, Contact

Contact the American Diabetes Association


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