It’s tempting to think that our bodies simply ‘slow down’ as we age, which makes it harder to keep weight off, but a study of 6,600 people aged between one week old to 95-years-old revealed that it’s not as simple as one might assume.
In our prior post, we defined what metabolism really is (a mixture of at least 3 different processes), so we can now move on to discussing how these processes change as we age.
A 2021 study, published in Science, found that our total daily energy expenditure is 50% faster in our first year of life than during adulthood. After our first birthday, our daily energy expenditure begins to taper off by some 3% each year until around the age of 20.
But here’s the surprise; instead of our total daily expenditure slowing gradually from say, the age of 30 onwards, it tends to remain very stable until the age of 50 or 60. After then, it decreases only slightly, by around 0.7% per year.
“Some people think of their teens and 20s as the age when their calorie-burning potential hits its peak…But the study shows that, pound for pound, infants have the highest metabolic rates of all.” – Dr. Katzmarzyk, Professor and Associate Executive Director for Population and Public Health Sciences at the Pennington Biomedical Research Center.
In essence, what this study shows is that the metabolism – and total energy expenditure – slows over time because of a mixture of factors, and not just because of age only. In other words, many people gain weight as they age for reasons other than what is often simply described as “the body slows down as you age”.
If you’re struggling more with your weight as you age, there are probably a few different things going on.
Problems and Solutions for Age-Related Weight Gain
1: Your Diet Has Changed
Diets can change in either direction with age, they might vastly improve as we realize the benefits of a healthy diet, or they might slip deeper and deeper into bad habits and indulgence!
What we do know is that a high-fat, low-protein diet lowers the thermic effect of food, which means that more excess calories end up deposited as fat.
A 2016 study from Purdue University found that a high-protein diet can boost the metabolism, boosting energy expenditure by around 100 calories per day. That’s 100 calories you’re losing for free, without moving, simply by eating high protein foods. For how long the increase in calorie burning by high protein diet lasts, is not clear, however.
Grabbing a shelf full of protein supplements in your 50s, 60s, or 70s is probably not required.
The following is a list of natural high-protein foodstuffs to consider:
Nuts
Beans, peas, and legumes
Seeds
Eggs
Soy
Unprocessed dairy
Oats and grains
Dark leafy vegetables
2: You’re Moving Less
Next up, it’s all too easy to start moving less with age. Rather than low-level exercise, it’s usually the more vigorous activities that start getting neglected with age.
Exercise demands remain quite consistent throughout life, and it’s generally now recommended that older adults up to the age of around 50 to 60 commit to a similar exercise regime as those aged much younger. The older we become however, limitations on exercise duration and intensity are imposed by illness and degenerative conditions such as arthritis, heart and lung disease and whatever injuries have occurred over the years.
A strong body of research has also found that more rigorous exercise like high-intensity interval training can protect seniors from an array of diseases whilst bolstering their metabolism. It is strongly advised, particularly in older individuals, that before stepping up your exercise regime to always consult a physician prior to starting.
3: You’ve Lost Muscle Mass
Muscle loss (sarcopenia) reduces BMR whilst simultaneously reducing the number of calories burnt during exercise. Harvard Health cites that muscle loss can hit 3% to 5% per year after the age of 30. A higher percentage of lean muscle tissue boosts the level of calories burnt during exercise and at rest, so fighting against muscle loss is a potent way to maintain a steady metabolism.
It’s possible to fight against muscle loss by engaging in strength and resistance training in addition to your standard exercise regime. Follow a strength or resistance training plan approved by a professional, aimed at your age group and skill level and always take things slowly at the start.
4: Your Hormone Levels Have Changed
The hormone levels of both men and women progressively change with age.
Whilst men obviously do not experience anything like the level of hormone change that comes with female menopause, they may still experience somewhat of a “male menopause” which involves the loss of testosterone often beginning during the 50’s. Obesity in men is also associated with lower testosterone levels, creating a vicious cycle of increasing obesity causing lower testosterone which then inhibits the ability to lose weight, and so on.
Medical News Today primarily recommends lifestyle changes to support hormone levels, including increasing exercise and decreasing consumption of processed and fatty foods. Limiting alcohol consumption is also recommended not only to reduce caloric intake but alcohol may also suppress male hormone (testosterone) production.
Some herbs and supplements are also suggested to support metabolic hormones – Ginseng, Maca, and Ashwagandha are amongst those that show the most promising preliminary evidence, though large-scale studies are still lacking.
Summary: How Getting Older Affects Your Metabolism
Age does affect the metabolism, but it’s not as simple as your body just “slowing down” as you get older – and we are not powerless to stop it!
We have greater control over our metabolism than generally assumed and making just a handful of small changes might be all it takes to beat the “middle-aged spread”.
Considering all 3 components of the metabolism – BMR, TEF, and TEE – helps target strategies aimed at improving each, such as switching to a high-protein diet to increase calorie burning during eating, increasing exercise, and also supporting hormone function, and increasing lean muscle mass to boost BMR.
A combined, holistic approach provides a much better outcome than focusing on just one part of the metabolism in isolation of the others.
Disclaimer: This and all articles at www.metabolism.com are for educational purposes only and are not intended as medical advice or treatment. By choosing to view this article you agree to the Terms of Use of Metabolink, Inc which can be found at https://metabolism.com/terms-of-service-and-our-privacy-policy/
The mission of the The Thyroid Project is to encourage sharing of information and experience between the public and the medical community about the treatment of hypothyroidism (low thyroid function). For at least the past few decades there is a growing awareness of “something missing†in the way suffers of hypothyroidism are treated for their disease.
Too many patients, as documented in an on-line study of 12,000 individuals conducted by the American Thyroid Association published in June 2018, (https://doi.org/10.1089/thy.2017.0681) , complain of persistent symptoms of hypothyroidism despite what their doctors believe is successful treatment with levothyroxine (brands include Synthroid, Unithroid, Tirosent, Levoxl). We believe something needs to be done to resolve this conflict between patients and their doctors.
By Gary M. Pepper, M.D. Ozempic, Rybelsus, Trulicity, Wegovy, Saxenda are the central players in the weight loss craze sweeping across the globe. Metabolisim.com has been monitoring this phenomenon from its beginnings in 2008 with its report “Lizard Spit Reduces Blood Sugar and Appetite”, regarding the first drug in this class, Byetta (exenatide). Caught In the middle of the current chaos are the medical experts who treat diabetes and have been prescribing these medications for more than a decade. Here is a brief commentary from one such board certified endocrinologist; “I started treating Type 2 diabetics with GLP-1 agonists more than 10 years ago. In some respects, these medications have revolutionized the treatment of diabetes by lowering blood sugar effectively and promoting weight loss at the same time, a unique combination of benefits. Not everyone benefits from these drugs to the same degree unfortunately, and I have seen lots of patients experience unacceptable side effects from them. Nothing though, has prepared me for what is happening now. Too often, I find myself confronting someone who expects me to prescribe one of these drugs just so they can lose weight. Sadly, one extreme example was someone who, despite battling a life threatening medical condition, was insistent on getting a prescription. At the same time my diabetic patients are scrambling to find a place to buy their medications if they can even afford it. It is disheartening, to say the least, and I dread the negative interactions with some of my patients I now face almost daily.”
Off- Label Use
The FDA is the U.S. government’s department tasked with evaluating and approving drugs for specific medical conditions. When a new medication is approved for treating a medical condition by the FDA the agency will, at the same time, set strict guidelines for exactly which patients may use the newly approved drug. When a medication is used “off-label” it means that these limitations are being overridden by the provider for a potential benefit which outweighs the drugs risks. It is a general misconception that off-label means illegal; it does not. This practice has been going on for ages and more than 20% of prescriptions in the United States are prescribed off-label. A common example is the use of beta-blockers (approved for heart problems) for the treatment of performance anxiety.
GLP-1 agonist drugs, as discussed recently by metabolism.com. were originally approved for the treatment of Type 2 diabetes in adults. In the past few years most of these same medications have gained unprecedented popularity for their “off-label” weight loss benefit. Of the 5 GLP-1 agents presently in U.S. pharmacies only Wegovy (semaglutide) and Saxenda (liraglutide) are FDA approved for treating obesity. Of these two, Wegovy is the newer and had been much more popular that its sister drug Saxenda, probably due to being dosed only once weekly compared to daily for Saxenda and less likely to cause side effects. Due to Wegovy’s soaring popularity, its manufacturer, Novo Nordisk, increased the price of Wegovy two times since its initial release.
by Gary M. Pepper, M.D. and Sam Jeans, MSc The global anti-obesity drug market, in 2021was valued at over $2 billion. Within one year this figure had skyrocketed to $8 billion and is expected to climb to nearly $ 20 billion by 2027. This astounding growth is a reflection of soaring obesity rates, and the arrival of a new class of weight loss medication fueling a craze both in the USA and across the world.
The FDA and global health regulators, until very recently, had maintained a very tight ship when it comes to treating obesity with medication, placing the emphasis on diet and exercise rather than weight loss drugs. Since the 80s, anti-obesity drugs continued to be controversial, and a more stringent FDA implemented ongoing safety trials along with other precautions. There is some speculation that a shift in attitude toward approval of weight loss medication by the FDA , is underway
Weight loss drug controversies are far from over and, in fact, may soon rival the amphetamine crisis of the 70’s. For that reason, metabolism.com has felt it important to provide our guide to weight loss drug issues, past and present.
Anti-Obesity Drugs Timeline
Prescription drugs for lifestyle diseases such as obesity were marketed heavily throughout the 1950s to the 1970s. Amphetamines entered the public domain after the Second World War where they were used extensively in the military.
In the 50s, walk-in clinics prescribed diet pills with other medications almost at random, with or without genuine concern for one’s weight. These brightly colored pills became known as “rainbow pills”.
In the 1960s and 1970s, the so-called “rainbow pill diet” of pills was finally coming to an end as the FDA began to systematically ban many of the drugs involved. A high-profile expose by investigative journalist Susanna Mcbee, published in Life magazine, brought attention to this new modern public health crisis.
The rainbow pill diet combined amphetamines, laxatives, thyroid hormones, and even diuretics to produce extreme weight loss, combined with benzodiazepines, barbiturates, and steroids to reduce side effects, and antidepressants to suppress medication-induced insomnia and anxiety.
In 1968, rainbow pills were linked to over 60 deaths, with numerous accounts of their devastating impact surfacing in the news and media. Within just two months, 48 million pills were seized and destroyed. Nevertheless, amphetamine-based diet pills remained extremely popular throughout the 1970s. In 1978, some 3.3 million prescriptions for amphetamines were written each year, with some 50 million pills a year ending up in the black market.
In 1979, the FDA banned amphetamines as a weight loss aid, but that is hardly the end of the USA’s love affair with obesity medication.
Here’s a brief timeline of recent anti-obesity drugs:
Lack of energy and inability to lose weight are constant challenges for many people and are every day complaints encountered in the doctor’s office. Almost anyone can find some relief from these problems by accessing the healing properties of physical activity. Mentioning to a patient the need for ‘more exercise’ often causes rolling of the eyes, sighing, shrugging, snorting or worse yet, the hundred-yard stare. We all know exercise is important but who has the energy for that? It seems like a vicious cycle. Surprisingly, when done correctly, exercise can improve energy with the additional advantage of promoting weight loss and restoring tone and stamina. It is helpful to remember that the human body was designed for a lot more physical activity and a lot less food than we are privileged to experience in present day life. It therefore takes will power and knowledge to maintain the environment required for optimal health. Here are eight steps to get in the swing of regular exercise. Some suggestions may surprise you.
