Over time, the surge and crash of dissolved glucose and insulin that occurs in diabetes can end up causing irreparable damage to many body organs and systems. Doctors refer to this as "end-organ damage" because it can effect nearly every organ system in the body:
Hypertension (High Blood Pressure) and Heart Disease. Hypertension is almost uniformly found in people with Type 2 Diabetes. As the blood glucose level increases our bodies attempt to use various means to lower the concentration of glucose back to "normal" levels. One way the body attempts to do this is by holding more fluid in the blood vessels. This extra fluid causes the pressure in the vessels to increase. Heightened blood pressure, in turn leads to a generalized weakening of the circulatory system. This can eventually lead to blood vessels bursting in some extreme cases (e.g., vascular stroke) or lead to the development of chronic blood flow problems in the limbs and other peripheral parts of the body. Chronically high insulin levels are also associated with early development of atherosclerotic plaques inside blood vessel walls, which lead to further risk of aneurysm, hypertension, stroke, and heart attack.
Eye Disease. Untreated diabetes can lead to a variety of eye problems including blindness and reduced vision. Diabetes is the #1 cause of acquired blindness in people under the age of 65 and is one of the leading causes in older adults. People with diabetes experience damage to blood vessels and nerves in the back of the eye, an area called the retina. This leads to a condition called "Diabetic Retinopathy." Diabetes can also cause abnormal new growth of capillaries inside the retina that degrade blood flow and weaken vision. Once it occurs, damage to vision is permanent. However, when identified early enough, many vision problems associated with diabetes can be repaired or avoided. Individuals with diabetes should have their eyes examined once a year by an eye doctor. People with diabetes can prevent eye problems by keeping their blood glucose under good control, lowering their blood pressure, and cholesterol levels.
Kidney Disease (Nephropathy). The kidneys main job is to filter blood. In those with diabetes, sugar that is filtered from the blood damages the blood vessels in the kidneys over time. This process is called "Diabetic nephropathy." In extreme cases diabetes can lead to kidney failure, necessitating frequent and expensive dialysis (machine filtration of the blood), or risky, expensive, and difficult to obtain kidney transplantation. Diabetes is the number one reason that Americans are on dialysis. Doctors test urine of patients with diabetes to monitor for kidney failure.
Nerve Damage (Neuropathy). Sugar in the blood damages the peripheral nervous system (that part of the nervous system that works the arms, legs and other extremities). Affected patients report pain, tingling or buzzing sensations in their hands and/or feet. Complete numbness (loss of sensation) in the limbs is also common. Patients may also lose bladder control, or the ability to walk. Male loss of ability to function sexually (impotence or erectile dysfunction) may also occur.
Joint and Foot Problems. Poor blood flow in the limbs combined with nerve damage and reduced or deadened sensation lead to a situation where the extremities (feet, hands) become easily susceptible to damage and disease. Damage to joints (caused by lack of ability to feel pain properly) and ulcers of the feet are common. Foot and limb problems related to diabetes can usually be helped with proper treatment. However, left untreated, damage can become infected and require amputation. In 2004 alone, 71,000 Americans required amputation of a foot or leg because of diabetes (CDC, 2008). It is imperative that those individuals with diabetes perform self-foot exams on a daily basis and that they undergo a foot exam by a health professional once a year.
Infections of the Skin. Diabetes can cause a number of skin conditions, including fungal (yeast) and bacterial infections, skin spotting (diabetic dermopathy), and a variety of spots, rashes and bumpy or oddly textured skin patches. Most of these conditions are related to chronically raised blood sugar levels, and become less of a problem once blood sugar is brought under control. Individuals with diabetes are also at increased risk of all types of infection because of impaired immunity (ability to fight infection). For this reason, it is important for people with diabetes to get annual influenza vaccinations and pneumococcal vaccine every five years.
Cognitive Issues. As one of the organs most affected by blood sugar fluctuations, the brain is also impacted by diabetes. Chronic uncontrolled diabetes appears to be associated with memory problems and dementia in the elderly, and may increase risk of Alzheimer's disease. In younger patients with Type 1 diabetes, elevated blood sugar levels were found to be associated with increased difficulty performing mental arithmetic and with decreased verbal fluency performance. This slowing of cognitive functions was reversible as sugar levels decreased.
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