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Papers In Press, published online ahead of print September 1, 2003
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Department of Nutritional Immunology Laboratory, JM USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111
Corresponding Author: simin.meydani{at}tufts.edu
Hypercholesterolemia is a risk factor for coronary heart diseases (CHD) and also could contribute to the impaired immune response. The National Cholesterol Education Program Expert Panel recommends Therapeutic Lifestyle Changes (TLC) diet to reduce risk for CHD. We investigated the effects of changing from a high-fat western diet to a low fat diet in accordance with TLC diet on immune functions of older adults with hypercholesterolemia to determine whether improving lipid profile via dietary intervention would have beneficial effects on immune functions. In a double blind study, eighteen subjects consumed both a Western diet (38% fat) and TLC diet (28% fat) for 32 days in a randomized order. Measures of cellular immune responses, including delayed type hypersensitivity (DTH) response, in vitro lymphocyte proliferation, and interleukin (IL)-2 production, and production of proinflammatory mediators, including tumor necrosis factor-a, IL-6, IL-1b, and prostaglandinE2 were determined. DTH response and lymphocyte proliferative response increased significantly (29% and 27%, respectively) after consumption of TLC diet. Our results indicate that consumption of a TLC diet enhances T cell-mediated immune functions in older adults with elevated cholesterol level. This might be a clinically important benefit considering the decline of T cell-mediated immune functions with aging and evidence of impaired immune function associated with hypercholesterolemia.
Revised on July 25, 2003
Accepted on August 19, 2003
Effect of therapeutic lifestyle change (TLC) diet on immune functions of moderately hypercholesterolemic humans
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