Many supplements — including 7-Keto — Ahd to boost metabolism and aid weight loss. Health Conditions Discover Plan Connect. By Razan Hallak, MS, RDN, LD.

Metabolism and aging -

DURHAM, N. But a new study suggests your metabolism -- the rate at which you burn calories -- actually peaks much earlier in life, and starts its inevitable decline later than you might guess.

The findings were published Aug. Pontzer and an international team of scientists analyzed the average calories burned by more than 6, people ranging from one week old to age 95 as they went about their daily lives in 29 countries worldwide.

Previously, most large-scale studies measured how much energy the body uses to perform basic vital functions such as breathing, digesting, pumping blood -- in other words, the calories you need just to stay alive. Scientists have used the technique -- considered the gold standard for measuring daily energy expenditure during normal daily life, outside of the lab -- to measure energy expenditure in humans since the s, but studies have been limited in size and scope due to cost.

Pooling and analyzing energy expenditures across the entire lifespan revealed some surprises. Some people think of their teens and 20s as the age when their calorie-burning potential hits its peak.

You can lose the weight. This study may be the reminder we need that a healthy diet and staying active are important at all ages, and not just to control weight.

Those are two major factors for overall health. We need to look at all the reasons a person may gain weight other than the presumed slowing of their metabolism.

Belury, who is also the vice president of the American Society for Nutrition , said the study makes the case for personalizing medicine. It builds on existing evidence that people need tailored nutrition, dietetics and medical care.

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Required fields. Tell us more about yourself. With this method, individuals drink water in which some of the hydrogen and oxygen have been replaced with isotopes of these elements that can be traced in urine samples.

The researchers analyzed average total daily energy expenditures, which include the calories we burn doing everything from breathing and digesting food to thinking and moving our bodies.

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.

Take, for instance, the finding that metabolic rate declines in seniors, which might have been expected. We can say, 'No, no, no, it's more than that. 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. But if changing metabolism is not playing a role in weight gain at certain points in adult life, there could be other contributing factors, she said.

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.

Malin said the findings, for instance, contradict the belief that adults experience a decline in metabolism as they move from their 20s into their 30s and that this may be contributing to the obesity epidemic. Pontzer said the findings in early life highlight the critical importance of infant nutrition meeting the increasing energy demands of growing babies.

In addition, he said, the study results could have implications for how much medicine people need at various ages, when they could be metabolizing drugs differently.

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