Although a number of things can add to weight gain during midlife, it's unlikely that a slowing metabolism is one of them, new evidence suggests.
is really steady from 20 to 60 years," added Pontzer, who is an associate professor of evolutionary anthropology and global health at Duke University in Durham, NC.Total energy spent or calories burned is important to human health and functioning of the body, but little research has looked beyond baseline energy needs or how total requirements to live and to perform day-to-day physical activities change over a lifetime.
To learn more, Pontzer and colleagues looked at total energy requirements in people from 8 days to 95 years old. Participants included 6,421 people across 29 countries. The study included a urine test that measures metabolism based on the speed with which drinking water with specially labelled hydrogen and oxygen molecules clear the body.
"People's intuitions about their metabolic rates don't have any real connection to their actual rate of energy expenditure. I suspect that what people experience and call metabolism is really their energy levels -- their feeling of vitality -- or how much weight they put on," Pontzer said.Before this research, Pontzer also pointed to a slow metabolism for his own experience.
Another surprise is the"very eye-opening" finding of how dramatically metabolic rates change over the life course, being remarkably elevated in early childhood and declining after roughly age 60, Pontzer said.John R. Speakman, PhDInterestingly, pregnant women in the study did not have needs beyond those expected for the added bulk from the growing baby.
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