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Primate growing up with half the calories: New understanding
about human health and longevity
Jan. 13, 2014 — New research shows that humans and other primates burn 50% f ewer calories each day
than other mammals. T he study, published January 13 in the Proceedings of the National Academy of
Sciences, suggests that these remarkably slow metabolisms explain why humans and other primates grow
up so slowly and live such long lives. T he study also reports that primates in zoos expend as much energy
as those in the wild, suggesting that physical activity may have less of an impact on daily energy
expenditure than is of ten thought.
Most mammals, like the f amily dog or pet hamster, live a f ast-paced lif e, reaching adulthood in a matter of
months, reproducing prodigiously (if we let them), and dying in their teens if not well bef ore. By comparison,
humans and our primate relatives (apes, monkeys, tarsiers, lorises, and lemurs) have long childhoods,
reproduce inf requently, and live exceptionally long lives. Primates’ slow pace of lif e has long puzzled
biologists because the mechanisms underlying it were unknown.
An international team of scientists working with primates in zoos, sanctuaries, and in the wild examined
daily energy expenditure in 17 primate species, f rom gorillas to mouse lemurs, to test whether primates’
slow pace of lif e results f rom a slow metabolism. Using a saf e and non-invasive technique known as
“doubly labeled water,” which tracks the body’s production of carbon dioxide, the researchers measured the
number of calories that primates burned over a 10 day period. Combining these measurements with similar
data f rom other studies, the team compared daily energy expenditure among primates to that of other
mammals.
“T he results were a real surprise,” said Herman Pontzer, an anthropologist at Hunter College in New York
and the lead author of the study. “Humans, chimpanzees, baboons, and other primates expend only half
the calories we’d expect f or a mammal. To put that in perspective, a human — even someone with a very
physically active lif estyle — would need to run a marathon each day just to approach the average daily
energy expenditure of a mammal their size.”
T his dramatic reduction in metabolic rate, previously unknown f or primates, accounts f or their slow pace of
lif e. All organisms need energy to grow and reproduce, and energy expenditure can also contribute to aging.
T he slow rates of growth, reproduction, and aging among primates match their slow rate of energy
expenditure, indicating that evolution has acted on metabolic rate to shape primates’ distinctly slow lives.
“T he environmental conditions f avoring reduced energy expenditures may hold a key to understanding why
primates, including humans, evolved this slower pace of lif e,” said David Raichlen, an anthropologist at the
University of Arizona and a coauthor of the study.
Perhaps just as surprising, the team’s measurements show that primates in captivity expend as many
calories each day as their wild counterparts. T hese results speak to the health and well-being of primates
in world-class zoos and sanctuaries, and they also suggest that physical activity may contribute less to
total energy expenditure than is of ten thought.
“T he completion of this non-invasive study of primate metabolism in zoos and sanctuaries demonstrates
the depth of research potential f or these settings. It also sheds light on the f act that zoo-housed primates
are relatively active, with the same daily energy expenditures as wild primates,” said coauthor Steve Ross,
Director of the Lester E. Fisher Center f or the Study and Conservation of Apes at Chicago’s Lincoln Park
Z oo. “Dynamic accredited zoo and sanctuary environments represent an alternative to traditional
laboratory-based investigations and emphasize the importance of studying animals in more naturalistic
conditions.”
Results f rom this study hold intriguing implications f or understanding health and longevity in humans.
Linking the rate of growth, reproduction, and aging to daily energy expenditure may shed light on the
processes by which our bodies develop and age. And unraveling the surprisingly complex relationship
between physical activity and daily energy expenditure may improve our understanding of obesity and other
metabolic diseases.
More detailed study of energy expenditure, activity, and aging among humans and apes is already underway.
“Humans live longer than other apes, and tend to carry more body f at,” said Pontzer. “Understanding how
human metabolism compares to our closest relatives will help us understand how our bodies evolved, and
how to keep them healthy.”
How and where to f ind cheap monkeys f or sale

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Primate growing up with half the calories: New understanding about human health and longevity

  • 1. m o nke ys-f o r-sale .o rg http://mo nkeys-fo r-sale.o rg/primate-gro wing-up-with-half-the-calo ries-new-understanding-abo ut-human-health-andlo ngevity/ Primate growing up with half the calories: New understanding about human health and longevity Jan. 13, 2014 — New research shows that humans and other primates burn 50% f ewer calories each day than other mammals. T he study, published January 13 in the Proceedings of the National Academy of Sciences, suggests that these remarkably slow metabolisms explain why humans and other primates grow up so slowly and live such long lives. T he study also reports that primates in zoos expend as much energy as those in the wild, suggesting that physical activity may have less of an impact on daily energy expenditure than is of ten thought. Most mammals, like the f amily dog or pet hamster, live a f ast-paced lif e, reaching adulthood in a matter of months, reproducing prodigiously (if we let them), and dying in their teens if not well bef ore. By comparison, humans and our primate relatives (apes, monkeys, tarsiers, lorises, and lemurs) have long childhoods, reproduce inf requently, and live exceptionally long lives. Primates’ slow pace of lif e has long puzzled biologists because the mechanisms underlying it were unknown. An international team of scientists working with primates in zoos, sanctuaries, and in the wild examined daily energy expenditure in 17 primate species, f rom gorillas to mouse lemurs, to test whether primates’ slow pace of lif e results f rom a slow metabolism. Using a saf e and non-invasive technique known as “doubly labeled water,” which tracks the body’s production of carbon dioxide, the researchers measured the number of calories that primates burned over a 10 day period. Combining these measurements with similar data f rom other studies, the team compared daily energy expenditure among primates to that of other mammals. “T he results were a real surprise,” said Herman Pontzer, an anthropologist at Hunter College in New York and the lead author of the study. “Humans, chimpanzees, baboons, and other primates expend only half the calories we’d expect f or a mammal. To put that in perspective, a human — even someone with a very physically active lif estyle — would need to run a marathon each day just to approach the average daily energy expenditure of a mammal their size.” T his dramatic reduction in metabolic rate, previously unknown f or primates, accounts f or their slow pace of lif e. All organisms need energy to grow and reproduce, and energy expenditure can also contribute to aging. T he slow rates of growth, reproduction, and aging among primates match their slow rate of energy expenditure, indicating that evolution has acted on metabolic rate to shape primates’ distinctly slow lives. “T he environmental conditions f avoring reduced energy expenditures may hold a key to understanding why primates, including humans, evolved this slower pace of lif e,” said David Raichlen, an anthropologist at the University of Arizona and a coauthor of the study. Perhaps just as surprising, the team’s measurements show that primates in captivity expend as many calories each day as their wild counterparts. T hese results speak to the health and well-being of primates in world-class zoos and sanctuaries, and they also suggest that physical activity may contribute less to total energy expenditure than is of ten thought.
  • 2. “T he completion of this non-invasive study of primate metabolism in zoos and sanctuaries demonstrates the depth of research potential f or these settings. It also sheds light on the f act that zoo-housed primates are relatively active, with the same daily energy expenditures as wild primates,” said coauthor Steve Ross, Director of the Lester E. Fisher Center f or the Study and Conservation of Apes at Chicago’s Lincoln Park Z oo. “Dynamic accredited zoo and sanctuary environments represent an alternative to traditional laboratory-based investigations and emphasize the importance of studying animals in more naturalistic conditions.” Results f rom this study hold intriguing implications f or understanding health and longevity in humans. Linking the rate of growth, reproduction, and aging to daily energy expenditure may shed light on the processes by which our bodies develop and age. And unraveling the surprisingly complex relationship between physical activity and daily energy expenditure may improve our understanding of obesity and other metabolic diseases. More detailed study of energy expenditure, activity, and aging among humans and apes is already underway. “Humans live longer than other apes, and tend to carry more body f at,” said Pontzer. “Understanding how human metabolism compares to our closest relatives will help us understand how our bodies evolved, and how to keep them healthy.” How and where to f ind cheap monkeys f or sale