Dementia is the term used to describe a group of symptoms that show significant deterioration of an individual’s intellectual and social abilities.
The deterioration in intellectual function is progressive and is characterized by memory and cognitive impairment involving deficits in reasoning, judgment, abstract thought, comprehension, learning, use of language, and task execution.
Some types of dementia can be reversed, while most types of dementia are degenerative or nonreversible.
Q: What causes dementia?
A: There are many differing causes of dementia. Here are some causes according to nonreversible and reversible:
- Nonreversible dementia may not be turned back due to these conditions:
- Alzheimer’s disease is the most common type of degenerative dementia caused by abnormal protein structures in certain areas of the brain.
- Lewy body disease is a leading cause of dementia in elderly adults.
- Vascular dementia due to many small strokes.
- Medical conditions: Huntington’s disease, multiple sclerosis, infections that can affect the brain, such as HIV/AIDS and Lyme disease, Parkinson’s disease, Pick’s disease, and progressive supranuclear palsy.
- Reversible dementia may be stopped or reversed if these conditions are found soon enough:
- Brain injury.
- Brain tumors.
- Chronic alcohol abuse.
- Changes in blood sugar, sodium, and calcium  levels.
- Changes that can occur with celiac disease, diabetes, thyroid disease, and other metabolic disorders.
- Nutritional deficiencies.
- Use of certain medications, including cimetadine and some cholesterol-lowering medications.1 
What Is Dementia In Celiac Disease and/or Gluten Sensitivity?
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http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001748/ ↩