By Tom Venuto
www.BurnTheFat.com

Is prolonged caloric restriction unhealthy?

When caloric restriction is practiced with optimal nutrition (CRON), it is not inherently unhealthy. Actually, it appears the reverse is true. First, the weight loss that comes with the low calories produces improvements in the health markers, as you would expect. Second, the meticulous choice of food from CRON practitioners, where they pick high nutrient foods and avoid empty calories means that they are making healthy food choices. Third, advocates say that the CR itself improves health. I wonder, however, how much does CR improve health independent of the weight loss and the optimal nutrition?

By losing fat and maintaining an ideal body composition (the fat to muscle ratio) and eating high nutrient density foods, I propose that even at a more normal caloric intake, you will get very significant health and longevity benefits. I also propose that gaining muscle in a natural way (no steroids) will increase your quality of life today and as you get older.

Aside from the fact that we are not lab rats, the truth is, none of us knows when our day will come. We could get plucked off this physical plane at any moment and have no control over how it happens. My belief is that we should make our lifestyle decisions based on quality of life, not just quantity of life. That includes our quality of life today as well as our anticipated quality of life when we are older. Maybe we ought to be focusing more on “health span” than life span.

Downsides of calorie restriction for life extension

One fact about calorie restriction that they often don’t mention on these talk shows is that the benefits of CR decline if you start CR at a later age. This was discussed in a research paper from the Journal of Nutrition called, “Starving for life: what animal studies can and cannot tell us about the use of caloric restriction to prolong human lifespan.” The author of the paper, John Speakman from the School of Biological Sciences at the University of Aberdeen in Scotland, said that the later in life you begin to practice CR, the less of an increase in lifespan you will achieve. Even if the CR proponents are right, if you started in your late 40′s or mid 50′s for example, the benefit would be minimal. If you started in your 60′s the effect would be almost nonexistent. Essentially, you have to “starve for life” to get the benefits.

While some CR proponents claim that they aren’t hungry and they cite studies suggesting that hunger decreases during starvation, Speakman and other researchers say that hunger remains a big problem during CR – especially in today’s modern society where we are surrounded with convenience food and numerous eating cues – and that alone makes CR impractical:

“Neuroendocrine profiles support the idea that animals under CR are continuously hungry. The feasibility of restricting intake in humans for many decades is questionable.”

Let’s suppose for a moment that CR is totally legit and the claims are true. Many of the proposed benefits of CR come at the expense of what many of us are trying to do here: gain and maintain lean body mass. One spokesman for CR is 6 feet tall and 130 pounds. Another poster boy for CR is 6 foot tall and 115 lbs. Measurements of rodents under CR not only show large reductions in skeletal muscle but also bone mass.

I am not suggesting that these CR practitioners are anorexic, a concern that has been raised about CR when practiced aggressively. However, they are losing large amounts of fat-free tissue and that is plainly obvious for all to see when you look at their bony physiques. I am not imposing my body standards on others, but 115 to 130 lbs at 6 foot tall is underweight for a man by any standard. Furthermore, researchers say that at the body mass indices sustained by most voluntary CR practitioners, we would expect females to become amenorrheic. “One thing that is completely incompatible with a CR lifestyle is reproduction” says Speakman.

With that kind of atrophy, I have to wonder what their quality of life will be like in old age. While many people struggle with body fat for most of their adult lives, I’m sure almost everyone knows an elderly person who wrestles with the opposite problem: they are seriously underweight and they struggle to eat enough and maintain lean body mass.

My grandmother, before she passed away, was under 80 lbs. We could not get her to eat. She was weak and very frail. I have reported many times about the research showing how most overweight people under estimate calorie intake and eat more than they think or admit. In elder care homes, the research has often showed the opposite – the patients over estimate how much they eat. They swear they are eating enough, but they arent and they keep losing dangerous amounts of weight. With underweight, atrophied seniors, weakness means less functionality and lower quality of life and a fall can mean more than broken bones, it can be life-threatening.

Part 3 coming soon!

For more information about Burn The Fat, Feed The Muscle, the “longevity lifestyle with more muscle”, visit: www.BurnTheFat.com

Train hard and expect success,

Tom Venuto
Fat Loss Coach
www.BurnTheFat.com

About the Author:
Tom Venuto is a fat loss expert, lifetime natural (steroid-free) bodybuilder, independent nutrition researcher, freelance writer, and author of the #1 best selling diet e-book, Burn The Fat, Feed The Muscle: Fat-Burning Secrets of The World’s Best Bodybuilders & Fitness Models (e-book) which teaches you how to get lean without drugs or supplements using secrets of the world’s best bodybuilders and fitness models. Learn how to get rid of stubborn fat and increase your metabolism by visiting: www.burnthefat.com

References:

Hunger does not diminish over time in mice under protracted caloric restriction. Hambly C, Mercer JG, Speakman JR.Rejuvenation Res. 2007 Dec;10(4):533-42.Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Bucksburn, Aberdeen, Scotland, United Kingdom.

Starving for life: what animal studies can and cannot tell us about the use of caloric restriction to prolong human lifespan.Speakman JR, Hambly C. J Nutr. 2007 Apr;137(4):1078-86. School of Biological Sciences, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK.

Can dietary restriction increase longevity in all species, particularly in human beings? Introduction to a debate among experts. Le Bourg E, Rattan SI. Biogerontology. 2006 Jun;7(3):123-5.

The potential for dietary restriction to increase longevity in humans: extrapolation from monkey studies. Ingram DK, Roth GS, Lane MA, Ottinger MA, Zou S, de Cabo R, Mattison JA.Biogerontology. 2006 Jun;7(3):143-8. Laboratory of Experimental Gerontology, Intramural Research Program, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA.

Caloric restriction in humans: potential pitfalls and health concerns. Dirks AJ, Leeuwenburgh C.Mech Ageing Dev. 2006 Jan;127(1):1-7. Epub 2005 Oct 13, Wingate University, School of Pharmacy, 316 N. Main Street, Wingate, NC 28174, USA.

Caloric restriction and human longevity: what can we learn from the Okinawans? D. Craig Willcox, Bradley J. Willcox Hidemi Todoriki. Biogerontology (2006) 7: 173-177

Endocrine alterations in response to calorie restriction in humans. Mol Cell Endocrinol. 2009 Feb 5;299(1):129-36. Epub 2008 Oct 21. Redman LM, Ravussin E. Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, United States.

Caloric restriction in the presence of attractive food cues: external cues, eating, and weight. Polivy J, Herman CP, Coelho JS.Physiol Behav. 2008 Aug 6;94(5):729-33. Epub 2008 Apr 13. University of Toronto, Canada.

Life Extension by Calorie Restriction in Humans. Everitt AV, Le Couteur DG.Ann N Y Acad Sci. 2007 Aug 23, Centre for Education and Research on Ageing, University of Sydney, Concord, New South Wales, Australia.

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