Chassy is professor emeritus in the department of food science and human nutrition at the University of Illinois.
The team from the Human Nutrition Research Centre of Auvergne, in Clermont-Ferrand, France looked at the behaviour of proteins in muscle.
Dr Hibbeln announced their conclusions on January 17th at a scientific meeting organised in London by the Institute of Brain Chemistry and Human Nutrition.
But Dr Ann Walker, senior lecturer in human nutrition at the University of Reading and a qualified medical herbalist, said the findings would make little difference to the average St John's wort user.
"Dark chocolate exhibits the greatest effects, milk chocolate fewer, and white chocolate no effects, " says the lead author of the study, Brian Buijsse, a nutritional epidemiologist at the German Institute of Human Nutrition, in Nuthetal, Germany.
However, the difference wasn't statistically significant because of the small number of women in the study who had been previously depressed, said Dr. Makrides, who is also a professor of human nutrition at the University of Adelaide.
The editorial, by Zhaoping Li and David Heber of the Center for Human Nutrition at the David Geffen School of Medicine, University of California, Los Angeles, urged clinicians to focus on "fat reduction rather than simply weight loss" in treating patients with obesity.
"I am currently studying Human Biology and Nutrition at Oxford, " she said.
McGovern convened the U.S. Select Committee on Nutrition and Human Needs, examining how the American diet might be contributing to declining population health.
WSJ: The Experts: What role should government play in combatting obesity?
To be a middle-middle-class American in the early 21st century is to occupy the 99.99 percentile of human existence, in terms of nutrition, wealth and ease.
Most of us think government's longstanding advice on good nutrition should come from the conclusions of a deliberative scientific process weighing top expertise in nutrition, public health and human physiology, not from negotiations with special interests.
WSJ: The Experts: What role should government play in combatting obesity?
President Obama has proposed replacing the regular consumer price index, or CPI, to adjust Social Security benefits with the chained CPI -- often called the cat food CPI because the index assumes that when the price of human food rises, seniors can substitute cheaper food to get the same nutrition.
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