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8) Overweight. Researchers found a very significant increase in dementia in those whose waist was too big in midlife.  However, just being overweight, regardless of the location on the body, is likely to cause issues: one recent UCLA study found that "overweight people had 4% less brain tissue than normal-weight adults".  This is likely due to clogged arteries and vessels which lowers blood flow and leads to cell shrinkage. Another study based out of Sweden found that being overweight at midlife increased your likelihood of dementia by about 60%. 
9) High Cholesterol. High cholesterol, among many other nasty things, has been associated now with Alzheimer's and dementia.  The study found that "people with total cholesterol levels between 249 and 500 milligrams were one-and-a-half times more likely to develop Alzheimer's disease than those people with cholesterol levels of less than 198 milligrams. People with total cholesterol levels of 221 to 248 milligrams were more than one-and-a-quarter times more likely to develop Alzheimer's disease". They were specifically talking about people who had cholesterol in their early 40's by the way and this backs up other previous research.  NOTE: The best way to lower high cholesterol is through the Low Fat (Ornish) Diet.
10) Stress. "Don't get stressed out" is good advice for your brain. It will age your cardiovascular system and literally rip apart your brain. And the suprising thing is that many counterintuitive aspects of life are actually stressors for your body and mind. For more information, read this link. By the way, Depression is a form of stress and very often leads to elevated Cortisol levels. High cortisol levels literally destroy your brain and some studies have shown that depressed individuals have a shrunken hippocampus, the center for memory. Read here for more details.
12) Inflammation. Researchers have long suspected that inflammation was a leading component of Alzheimer's and other dementias. For example, many researchers have noticed that those taking NSAIDs (Advil, Ibuprofen, Motrin, etc.) have significantly better outcomes for Alzheimer's. (Unfortunately, NSAID's are also associated with erectile dysfunction and a wide variety of GI disorders!) Furthermore, it was well-known that head traumas and all the associated inflammatory response was a major risk factor for developing Alzheimer's later in life. Just recently the suspicions were strongly confirmed in a September 8, 2009, print issue of Neurology study that showed that seniors with inflammation from an infection were had memory loss at twice the rate of someone without such an infection. And participants that happened to have high TNF alpha levels before the study had on average ten times the rate of memory loss. Please see this link on How to Lower Inflammation for more information.
13) Lack of Sleep. Evidence is continuing to mount that lack of sleep helps lead to dementia. Of course, this is no shock because anything that leads to increase arteriosclerosis, inflammation and high blood pressure is bound to lead to troubles for your grey matter. In addition, scientists recently found that it also directly increases beta amyloid and the associated plaques that are so characteristic of Alzheimer's.  You don't want plaque in your brain anymore than you want it in your arteries!
14) CoQ10 Megadosing. According to one animal study, megadosing on CoQ10 will damage hearing and memory. See this link on The Dangers of Supplementation for more details.
15) Heavy Alcohol Consumption. Chronic, heavy drinking is so hard on the brain that it actually shrinks it. Furthermore, alcohol is neurotoxic and the reason appears to be that it actually stimulates glutamate - can you say Excitotoxin? - activity leading to neuronal death and injury. 
2) Achieving Optimal Memory, Aaron Nelson, Ph. D, p.64, McGraw-Hill, 2005
3) Brain Research Reviews, Feb 1997, 23(1-2):134-143
4) BMJ-British Medical Journal (2009, February 13). Second-hand Smoke May Cause Dementia. ScienceDaily. Retrieved March 11
5) Amer J Clin Nutr, Received for publication February 3, 2009. Accepted for publication May 21, 2009; Emiliano Albanese, et al; "Dietary fish and meat intake and dementia in Latin America, China, and India: a 10/66 Dementia Research Group population-based study"
6) FASEB J, 2009 Aug 10. [Epub ahead of print], Murray, et. al., "Deterioration of physical performance and cognitive function in rats with short-term high-fat feeding"
7) Neurology, Received August 15, 2007, Accepted December 14, 2007, "Central obesity and increased risk of dementia more than three decades later", R. A. Whitmer PhD, et. al.
8) American Academy of Neurology (2008, April 16). High Cholesterol In Your 40s Increases Risk Of Alzheimer's Disease. ScienceDaily.
9) NEUROLOGY 2007;68:751-756, "Serum cholesterol changes after midlife and late-life cognition"
10) J of Neurology, Neurosurgery, and Psychiatry, 2008;79:864-868, Published Online First: 5 Feb 2008,"Changes in folate, vitamin B12 and homocysteine associated with incident dementia"
11) Science, Science Express Index, DOI: 10.1126/science.1180962, Published Online September 24, 2009, Submitted on August 24, 2009, Accepted on September 11, 2009, "Amyloid- Dynamics Are Regulated by Orexin and the Sleep-Wake Cycle", Jae-Eun Kang, et. al.
12) Neurology, 73(8):589-595, August 25, 2009, "Association of higher diastolic blood pressure levels with cognitive impairment"
13) Neuron, 2009 Oct 29, 64(2):213-26, "Dual palmitoylation of NR2 subunits regulates NMDA receptor trafficking"
14) Prevention, Jan 2010, p. 14.
15) Alcoholism: Clinical and Experimental Research, Published Online: 11 Apr 2006, 16(3):539-541, "Alcohol, Nitric Oxide, and Neurotoxicity: Is There a Connection?—a Review"
16) International Journal of Obesity, 2009, 33:893–898; "Overweight in midlife and risk of dementia: a 40-year follow-up study"
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