Metabolic rate remains stable all through adult life, from age 20 to 60 years old.
, because that represents how all our cells are busy all day doing their various tasks, and we didn't have a good sense of how that changes over the course of a lifespan,” Pontzer said. “You need really big data sets to be able to answer that question. And this was the first time that we had the ability to do this with a really big data set that would allow us to pull apart the effects of body size and age and gender and all these things on our energy expenditures over the day.
Results did not show that metabolic rates spiked upward during the teen years or pregnancy, as commonly thought, or that there were specific differences between men and women after accounting for body size and composition.Registered dietitian Colleen Tewksbury, a senior research investigator at the University of Pennsylvania and a spokesperson for the Academy of Nutrition and Dietetics, said the new study is surprising.
“There are lots of things that impact weight status and also someone's nutritional status,” Tewksbury said. “It's not as simple as just one food or one lifestyle change or one change from a biological standpoint. It's more likely a much more complex web of lots of different changes happening at once. So that could be changes to food intake. It could be changes in activity levels. It can be where they're living, what they have access to, what are their sleep changes.
“It's not as if the weight gain is occurring because you don't ‘burn the same calories’ anymore,” he said.
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