Actually, it's the other way around: high HDL and high cholesterol appear to be protective against dementia. Your HDL is very high at 65:
http://archneur.jamanetwork.com/arti...ticleid=801799
Results: Higher levels of HDL-C (>55 mg/dL) were associated with a decreased risk of both probable and possible AD and probable AD compared with lower HDL-C levels (hazard ratio, 0.4; 95% confidence interval, 0.2-0.9; P = .03 and hazard ratio, 0.4; 95% confidence interval, 0.2-0.9; P = .03). In addition, higher levels of total and non–HDL-C were associated with a decreased risk of AD in analyses adjusting for age, sex, education, ethnic group, and APOE e4 genotype.
(Risk ratio of 0.4 = only 40% as likely to develop AD as someone with HDL < 55.)
"Our study clearly makes the point that high cholesterol may contribute directly or indirectly to plaques in the brain," Sasaki said,
"but failed treatment trials of cholesterol-lowering drugs in Alzheimer's disease means there is no simple link between lowering cholesterol and preventing Alzheimer's."
http://www.sciencedaily.com/releases...0912164005.htm
Apparently being a Swedish woman also means that high cholesterol != Alzheimer's:
http://www.hopkinsmedicine.org/news/...study_suggests
Result: either high cholesterol causes dementia or low cholesterol causes dementia. Unless you're a women in Sweden. Since the results are all over the place, I'm inclined to believe that it's not a big risk factor either way and you should stop worrying about it.
(Also note: "Cholesterol test" is a grievous misnomer: it measures lipoproteins, not cholesterol, and intake of dietary cholesterol (i.e. actual cholesterol) is not at all correlated with levels of blood lipoproteins (called "blood cholesterol").
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