Hive Health Media

Starvation and Immortality: The Curious (and Incredible) Effect of Deprivation

Extending life has always been an endeavor that’s captured the human imagination. Our written history is replete with folk tales and urban legends about rituals, remedies, and spiritual practices that heal our wounds, maintain our vitality, and keep us drinking from the fountain of youth. Many religious dogmas are centered around the goal of securing our place in heaven. Extending life beyond death.

In the centuries since, our priorities haven’t changed. We spend an increasingly larger share of our national GDP on life-extending procedures and medications, and the 20th century had more than its share of technologists and visionaries dreaming up scenarios where we’d use scientific innovation to increase our life span to infinity and beyond.

 Does Caloric Intake Affect Longevity?

Of course philosophers and poets have had plenty to say about whether or not such a state of being is preferable or not. However, on the margin it doesn’t change the preference most of have towards extending our life. That is, on most days it’s better to be alive than dead.

Diet

The science of life extension has sprawled out into an eclectic mix of scientific disciplines. Genomics, bio-informatics, cell biology and other branches of the life sciences have taken their turn at hacking the human genome. These attempts have had varying degrees of success, but over the decades one discipline has enjoyed a surprising amount of success over the others: nutrition. Certainly not the sexiest of fields, but nutrition has the benefit of studying the most basic interaction our bodies have with the environment around us: the food we put in our mouths. And when it comes to food and expanding life spans, a clear best practice has emerged over the last 50 years: don’t eat very much of it.

Caloric restriction is the act of continuously depriving the body of calories compared to some baseline that it’s used to. On-going caloric restriction has shown to be remarkably robust at extending life spans, delaying the onset of age related diseases and maintaining metabolic balances.

Research on caloric restriction began in the 1950’s when scientists began to starve rats to study its effect on their observed behavior and physiological health. To  their surprise, the starved rodents had improved mental agility, hormonal balances, and health in old age. They lived a lot longer too. Research began to study the effect in other animals and the results were consistent: fewer calories meant longer lives. From bacteria like C. elegans, to fruit flies, dogs and our closest primates, caloric restriction always seemed to extend time on earth.

[box type=”note”]In fact, the correlation has become so strong that the burden of proof has reversed itself. Scientists are now challenged to find an example where caloric restriction doesn’t extend life and improve health.[/box]

Humans

Of course, there are problems when we apply this finding to humans. We’re not fruit flies or lab rats, and we can’t starve ⅓ of the population their whole lives and wait and see what happens. However, a number of studies that indirectly measure the effect of caloric restriction suggest the results are the same for humans as they are for the rest of the animal kingdom.

For one, our closest relative in the animal kingdom have shown remarkable benefits when given a calorically restricted diet. A study published in the European Journal of Clinical Nutrition found that rhesus monkeys that were fed 30% less calories than a control group aged more slowly, had lower blood pressure, increased insulin sensitivity, and less warning signs of cardiovascular disease and cancer. This type of finding is particularly remarkable because rhesus monkeys that are malnourished develop “lifestyle diseases” in a manner that’s very similar to humans.

Okinawans

Perhaps the strongest case for the benefits of caloric restriction in humans is the study of the most prolific group of centenarians on the planet: the Okinawans. Okinawa is a region in the south of Japan that became famous when researchers discovered they had a much higher portion of people living beyond 100 than other parts of the world. A flurry of research about their lifestyle quickly followed.

One fact that soon became apparent is the Okinawans had a diet that was quite distinct from the rest of the world. Their typical meals consisted of lots of fruits and vegetables, water-based soups, and had little meats or calories. Compared to the rest of the world they had a diet that was both calorically restricted and nutrient dense. In fact, it was found that the typical Okinawan consumed 40% fewer calories than the typical American.

Furthermore, clinical studies have shown that caloric restriction causes physiological changes that are dramatic and rapid in people who adopt the habit in the middle of life. A paper published in the New York Academy of Sciences found that people who reduced their caloric intake by 20% had reduced blood pressure and cholesterol, lower blood sugar, and increased insulin sensitivity after 2-6 years. Even after six months, subjects displayed favorable biomarkers. Caloric restriction might be the reason women live longer than men. On average they consume 25% fewer calories and live 5 years longer.

Warnings

Of course, this sort of news should not come without its caveats. The most important detail to take note of is that caloric restriction has only been shown to be effective when nutrients are not sacrificed as well. So only snacking on sweets and fast foods will not have the desired effect. Neither will anorexia or bulimia.

In fact, several studies have suggested that it’s the nutrient density of reduced calorie diets and not the calories themselves that have the life-extending effects. Furthermore, extreme dieting has shown to have the opposite effect of a calorie restricted diet. After going on a radical diet people have a tendency to binge eat and lose any gains they have made after extreme fasting.

[box type=”important”]So take this news with a bit of caution. The benefits of reducing your calories while still maintaining high levels of vital nutrients like vitamin A, B, C, D and anti-oxidants and phyto-chemicals seems to have remarkable effects on the human body. However, this is not the same thing as fad dieting, starvation, or an endorsement of adopting an eating disorder. Rather, it’s an embrace of the advice Michael Pollan gives his readers in his book the Omnivore’s Dilemma: Eat food, not too much, mostly plants.[/box]

References

  1. Ellers J, Ruhe B, Visser B. Discriminating between energetic content and dietary composition as an explanation for dietary restriction effects. J Insect Physiol. 2011 Sep 5
  2. Cruzen C, Colman RJ. Effects of caloric restriction on cardiovascular aging in non-human primates and humans. Clin Geriatr Med. 2009 Nov;25(4):733-43
  3. Willcox BJ, Willcox DC, Todoriki H, Fujiyoshi A, Yano K, He Q, Curb JD, Suzuki M. Caloric restriction, the traditional Okinawan diet, and healthy aging: the diet of the world’s longest-lived people and its potential impact on morbidity and life span. Ann N Y Acad Sci. 2007 Oct;1114:434-55
  4. Everitt AV, Le Couteur DG. Life extension by calorie restriction in humans. Ann N Y Acad Sci. 2007 Oct;1114:428-33. Epub 2007 Aug 23. Review
  5. Houthoofd K, Vanfleteren JR. The longevity effect of dietary restriction in Caenorhabditis elegans. Exp Gerontol. 2006 Oct;41(10):1026-31.
  6. Partridge L, Piper MD, Mair W. Dietary restriction in Drosophila. Mech Ageing Dev. 2005 Sep;126(9):938-50
  7. Piper MD, Mair W, Partridge L. Counting the calories: the role of specific nutrients in extension of life span by food restriction. J Gerontol A Biol Sci Med Sci. 2005 May;60(5):549-55.
  8. Kealy RD, Lawler DF, Ballam JM, Mantz SL, Biery DN, Greeley EH, Lust G, Segre M, Smith GK, Stowe HD. Effects of diet restriction on life span and age-related changes in dogs. J Am Vet Med Assoc. 2002 May 1;220(9):1315-20
  9. Roth GS, Ingram DK, Black A, Lane MA. Effects of reduced energy intake on the biology of aging: the primate model. Eur J Clin Nutr. 2000 Jun;54 Suppl 3:S15-20.
  10. Pollan, Michael.  2006  The omnivore’s dilemma : a natural history of four meals / Michael Pollan  Penguin Press, New York
  11. Christy F. Telch, W. Stewart Agras, The effects of a very low calorie diet on binge eating, Behavior Therapy, Volume 24, Issue 2, Spring 1993, Pages 177-193, ISSN 0005-7894, 10.1016/S0005-7894(05)80262-X.
  12. (http://www.sciencedirect.com/science/article/pii/S000578940580262X
Jonathan Bechtel is the founder of Health Kismet, a green superfood powder that condenses 35 types of raw produce into a powder that can be mixed with water, juice, smoothies, or into a meal. He blogs at blog.healthkismet.com.

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