Epidemiology of Egg Consumption and Coronary Heart Disease

Posted on December 25, 2010 by admin

Egg Consumption and Coronary Heart Disease: An Epidemiologic Overview

Stephen B. Kritchevsky, PhD, David Kritchevsky, PhD, FACN

Department of Preventive Medicine, University of Tennessee Health Sciences Center, Memphis, Tennessee (S.B.K.) and Wistar Institute, Philadelphia, Pennsylvania (D.K.) E-mail: skritchevsky@utmem1.utmem.edu

Serum cholesterol has been established as a modifiable risk factor for coronary heart disease. Experimental feeding studies show that saturated fat and cholesterol increase serum cholesterol levels; thus, dietary recommendations for lowering the risk of heart disease proscribe the intake of both substances. Continue reading →

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Eggs and Coronary Heart Disease

Posted on December 25, 2010 by admin

The Impact of Egg Limitations on Coronary Heart Disease Risk: Do the Numbers Add Up?

Donald J. McNamara, PhD

Egg Nutrition Center, Washington, DC E-mail: enc@enc-online.org

For over 25 years eggs have been the icon for the fat, cholesterol and caloric excesses in the American diet, and the message to limit eggs to lower heart disease risk has been widely circulated. The “dietary cholesterol equals blood cholesterol” view is a standard of dietary recommendations, yet few consider whether the evidence justifies such restrictions. Continue reading →

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Choline, Development and Memory

Posted on December 25, 2010 by admin

Choline: Needed For Normal Development of Memory

Steven H. Zeisel, MD, PhD

Department of Nutrition, School of Public Health, School of Medicine, University of North Carolina at Chapel Hill, North Carolina E-mail: steven_zeisel@unc.edu

Choline is a dietary component essential for normal function of all cells. It, or its metabolites, assures the structural integrity and signaling functions of cell membranes; it is the major source of methyl-groups in the diet (one of choline’s metabolites, betaine, participates in the methylation of homocysteine to form methionine); and it directly affects nerve signaling, cell signaling and lipid transport/metabolism. Continue reading →

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Carotenoids and Age-Related Macular Degeneration

Posted on December 25, 2010 by admin

The Potential Role of Dietary Xanthophylls in Cataract and Age-Related Macular Degeneration

Suzen M. Moeller, MS, Paul F. Jacques, DSc, Jeffrey B. Blumberg, PhD, FACN

Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts E-mail: blumberg@hnrc.tufts.edu

The carotenoid xanthophylls, lutein and zeaxanthin, accumulate in the eye lens and macular region of the retina. Lutein and zeaxanthin concentrations in the macula are greater than those found in plasma and other tissues. A relationship between macular pigment optical density, a marker of lutein and zeaxanthin concentration in the macula, and lens optical density, an antecedent of cataractous changes, has been suggested. Continue reading →

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High Protein Diets and Exercise

Posted on December 25, 2010 by admin

Beyond the Zone: Protein Needs of Active Individuals

Peter W.R. Lemon, Ph.D

Exercise Nutrition Research Laboratory, The University of Western Ontario, London, Ontario, CANADA E-mail: plemon@julian.uwo.ca

There has been debate among athletes and nutritionists regarding dietary protein needs for centuries. Although contrary to traditional belief, recent scientific information collected on physically active individuals tends to indicate that regular exercise increases daily protein requirements; however, the precise details remain to be worked out. Continue reading →

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