45. Alzheimer’s disease

Alzheimer’s disease is a major national health problem. Nearly 2 million Americans over the age of 65 have Alzheimer’s disease. It is a leading cause of death among the elderly. But Alzheimer’s disease is not 1) ___. There may be a million or more people under the age of 65 suffering from the disease.

At one time, people suffering from the disease were said to be “getting old”. The disease was thought to be a natural part of growing old, but it is now known that Alzheimer’s disease 2) __ young and old alike, it is an organic disease that destroys brain 3) ___.

Alzheimer’s disease affects the patient’s memory, speech, and movement. In the beginning stages of the disease, the patient may seem slightly 4) ____. He may have trouble speaking. Then the patient’s memory begins to fall. He may forget dates, telephone numbers, names and plans. As the disease 5) ____, the patient may not recognize family and friends, these symptoms often cause terrible anxiety in the patient. He may feel lost and frightened. Sometimes the patient reacts with wild and bad behavior. 6) ____, the patient may not be able to takecare of himself. He may have lost the ability to speak and walk.

Scientists don’t know exactly what causes Alzheimer’s disease. It may be caused by a 7) ____. It may be caused by a poisonous 8) ____ in the environment. At present, 9) ____. But there are ways to slow its progress. Exercise and physical 10) ____ can help the patients of this disease.