What is the secret to your longevity?

Human beings and other primates have an extremely slow metabolism rate. They burn almost 50 percent fewer calories each day than other mammals, which is why they have a longer lifespan, say scientists.

The key to longevity is a slow metabolism rate, say scientists.

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Humans and other primates burn 50 percent fewer calories each day than other mammals and due to their low metabolism rate, they have a longer life span, according to a paper published in the Proceedings of the National Academy of Sciences.

Overall, 17 primate species, such as humans, gorillas, and mouse lemurs were examined for the purpose of the study.

The international group of scientists who carried out the study worked with animals in zoos, sanctuaries in Africa, and in the wild.

Daily energy expenditure of the primates was calculated using a technique called "doubly labeled water," Herman Pontzer, an anthropologist at Hunter College in New York and the lead author of the study, told The Monitor.

Water contains hydrogen and oxygen. Some of the hydrogen and oxygen in the water were being replaced with their variants, also called isotopes, Dr. Pontzer says. After animals drink water, these isotopes would then act as tracers and their presence could be found in their urine. By determining the concentration of isotopes from the urine sample, Pontzer and his team determined how much carbon dioxide the body produced. Over a 10-day period, scientists measured the number of calories primates burned, says Pontzer.

Comparing the results of the experiment with similar data from other studies, the team compared daily energy expenditure among primates to that of other mammals, according to a press release by Chicago's Lincoln Park Zoo. Chimpanzees and gorillasfrom the zoo were examined for the study.

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What is the secret to your longevity?