American Society For Nutrition

Calorie Restriction May Not Be Key to Longevity

Calorie Restriction May Not Be Key to Longevity

Excellence in Nutrition Research and Practice
Posted on 04/25/2010 at 02:48:48 PM by EB 2010 Blogger
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By: Rebecca Scritchfield, RD, ACSM Health Fitness Specialist
ASN Blogger at EB 2010

For years, researchers have been interested in the possibility that very low calorie diets could increase life expectancy in humans. This hypothesis came after some promising research studies on rats.

But recent research data show that it depends on how early in life you start restricting calories and the rewards of restriction may no be worth the cost. For example, a 30% calorie restriction for 7 years may only add a year or two of life and the limited evidence on humans indicate side effects of feeling cold all the time, excessive hunger, and loss of libido. As a dietitian who counsels clients on healthy weight management, I have seen anecdotally many other negatives of restriction. They lead to frequent thoughts of food, binge eating, and not to mention psychological problems.

Listen to Dr. Mary Ann Johnson summarize the calorie restriction session presented at the 2010 Aging Symposium for ASN.

Rebecca Scritchfield is a Washington, D.C. based registered dietitian in private practice specializing in healthy weight management. She is a member of ASN and is covering several events at EB 2010 through social media.

1 Comment
Posted Apr 27, 2010 7:05 PM by Emily Tomayko

One of the finalist for the Student Interest Group Travel Award gave a really great presentation on calorie restriction. He also mentioned that intermittent fasting (every other day but still maintaining calorie intake average between the two days) could potentially mimic some of the effects of calorie restriction. I wonder what kind of side effects are reported with intermittent fasting as opposed to full-on calorie restriction?