"We found that high cholesterol levels were significantly related to brain plaques associated with Alzheimer`s disease," said study author Kensuke Sasaki, of Kyushu University in Fukuoka, Japan, in a press release.
For the study, the cholesterol levels were tested on 2,587 people grouping 40 to 79 in age who had no signs of Alzheimer`s disease. Researchers also examined 147 autopsied people who died after a long observation period (10 to 15 years). Fifty of the demised, or 34 percent, had been diagnosed with dementia before death.
The autopsies looked for plaques and tangles in the brain, both known to be trademark signs of Alzheimer`s disease. Plaques are an accumulation of a form of the protein amyloid, which occurs between nerve cells. Tangles are an accumulation of a different protein, called tau, which occurs inside nerve cells.
People with high cholesterol levels, defined by a reading of more than 5.8 mmol/L, had significantly more brain plaques when compared to those with normal or lower cholesterol levels. A total of 86 percent of people with high cholesterol had brain plaques, compared with only 62 percent of people with low cholesterol levels.
The study found no link between high cholesterol and the tangles that develop in the brain with Alzheimer`s disease.
"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."