GE changed our lives. What went wrong? Crypto: The future of money or the biggest scam? NBA icon: Aaron Rodgers' vaccine lies destroy confidence. Tesla shares fall after Elon Musk's Twitter poll. See this new 70s-inspired electric Ford concept truck. Your metabolic rate is the rate at which your body burns calories to keep you alive and functioning.
It's a generally accepted belief that as you age, your resting metabolism slows --especially over age And if you are a woman in menopause, your metabolism slows even more.
Not true, says a new paper published in Science. How to start a healthy morning routine — and stick with it. Further countering conventional wisdom, the paper cites no real differences between resting metabolic rates of men and women, even for menopausal women, when controlling for other influences.
Now you might be wondering why you feel like your metabolism has slowed down. Read More. The answer is less about age and more about lifestyle. Although your baseline resting metabolic rate may not have changed between ages 20 and 60, the factors involved in boosting other aspects of your metabolism -- when you are not resting -- likely changed, lowering your ability to metabolize fat, maximize the caloric burn from exercise, increase energy-burning muscle mass and get quality rest to enable metabolic processes.
Don't worry -- this isn't bad news. It actually means that you have the power to make changes that will boost your metabolism, regardless of your age.
Read on for four science-backed ways to boost your metabolism. Important note: Consult your doctor before beginning any new exercise program. Be active throughout the day. When asking yourself why you feel like your metabolism has slowed down with age, you should also question whether your daily activity level has slowed down. In addition to all the other health risks associated with prolonged sitting , experts point to consistent inactivity as the biggest detriment to your metabolism.
Fat metabolism refers to the type of fuel you are burning during resting metabolism. In the past, research into energy expenditure has mostly focused on resting or basal metabolism, which is the number of calories burned just to keep the body ticking over.
Basal metabolism includes the energy that the body devotes to vital functions, such as breathing, digesting food, and pumping blood around the body. For example, it does not include commonplace but energetic activities, such as walking, climbing stairs, jogging, or shopping for groceries.
This method requires study participants to drink water that contains unusual isotopes heavier versions of hydrogen and oxygen atoms. Researchers then analyze daily urine samples from each person to track the rates at which their body excretes each isotope.
The difference between the two elimination rates reveals how much carbon dioxide the person is producing, which, in turn, reflects the rate at which they are burning calories. Since the s, researchers have used doubly labeled water to monitor how many calories humans burn as they go about their daily activities.
However, the high cost of the oxygen isotope has limited the scale of such studies. The new study overcame this limitation by pooling the results from numerous studies around the world in a single database. The authors write that the surprisingly high metabolic rate that they found in the tissues of infants might relate to their rapid growth and development.
In contrast, reduced energy expenditure in older people may reflect a decline in metabolism in their organs. The scientists believe that the metabolic changes that they have identified will lead to further investigations of disease progression, drug activity, and healing, which are all intimately related to metabolic rate.
In addition, they note that their research identified considerable differences in energy expenditure among individuals, even after they accounted for body composition, sex, and age. One of the limitations of the study was that it provided no information about possible contributory factors, such as diet and physical exercise.
In an accompanying comment article , two doctors argue that it may be no coincidence that tissue metabolism — which partly reflects the energy that the body devotes to maintenance and repair — begins to decline just as age-related diseases start to increase in frequency.
Timothy Rhoads and Rozalyn Anderson from the School of Medicine and Public Health at the University of Wisconsin-Madison point out that studies in animals show that metabolic changes are central to the aging process. It cannot be a coincidence that the increase in incidence of noncommunicable diseases and disorders begins in this same time frame.
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.
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