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Inflammation blocks impact of heart healthy diets for some

Results of a Johns Hopkins study suggest that natural chemicals released in the body as a result of chronic inflammation may underpin the failure of low-fat, so-called heart healthy diets to actually reduce cholesterol and heart disease risk in some people.

According to the study's results, published in the July 15 issue of Circulation, measuring circulating blood levels of C-reactive protein -- a marker of inflammation already linked to increased risk of heart disease -- may predict who might benefit from a reduced-fat, low-cholesterol diet and who might not.

For the study, a team led by Thomas "Tate" P. Erlinger, M.D., M.P.H., assistant professor of medicine, tracked 100 subjects with elevated CRP levels following a reduced-fat, low-cholesterol diet for 12 weeks. They found that overall, this group had less of a reduction in total cholesterol and low-density lipoprotein (LDL) or "bad" cholesterol levels. Subjects also had a greater increase in triglycerides compared with another group on the same diet but with lower CRP levels.

Subjects with lower CRP readings at the start of the study (less than 2.37 milligrams per liter) had a nearly 10 percent drop in total cholesterol and nearly 12 percent reduction in LDL cholesterol. Their triglycerides were not affected. In those with higher CRP (more than 2.37 mg/L), total and LDL cholesterol were lowered by only 3 percent each, while triglycerides rose by 19 percent.

Erlinger cautions that the study sample was small and did not examine the impact of weight loss on CRP levels.

"An important implication of our findings is that we may be able to use CRP testing to distinguish those who are likely to have a favorable response to a reduced-fat, low-cholesterol diet from those who will not respond well," says Erlinger. "It may also help explain why different people on the same diet may have widely varying results. It's too early for broad recommendations, but additional r
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Contact: Karen Blum
kblum@jhmi.edu
410-955-1534
Johns Hopkins Medical Institutions
15-Jul-2003


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