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Can Yogurt And Kefir Help Prevent Age-Related Muscle Loss? New Review Explains

Yogurt And Kefir For Gut Health

A spoonful of <span>yogurt</span> or a sip of <span>kefir</span> is usually sold as a gut-health food. A new scientific review asks whether the bacteria in these foods might also help keep muscles strong as people age.

Published in Communications Biology, a Nature Portfolio journal, the review was written by Dominic N. Farsi, Paul D. Cotter, and Orla O’Sullivan, researchers affiliated with Teagasc Food Research Centre in Ireland, APC Microbiome Ireland, and King’s College London, according to the paper. The authors examined lab, animal, and human research on what’s called the gut-muscle axis, a two-way chemical communication network between gut bacteria and muscle tissue. Gut bacteria release byproducts that travel through the bloodstream and may influence muscles, while exercise sends signals back that can alter the gut, the review explains.

Their overall take mixes genuine interest with caution: the biological mechanism looks plausible, but solid proof that fermented foods actually build or strengthen human muscle is still missing.

<strong>Also Read:</strong> <a href="https://www.healthandme.com/nutrition/high-fibre-diet-outperforms-metformin-in-blood-sugar-control-and-weight-loss-study-finds-article-156367471" data-type="tilCustomLink" target="_blank">High-Fibre Diet Outperforms Metformin In Blood Sugar Control And Weight Loss, Study Finds</a>

<h2>Why muscle loss matters, and where gut bacteria fit in</h2>

Beyond movement, muscle helps regulate blood sugar. Losing it with age, a condition called sarcopenia, is linked to frailty and loss of independence, the authors note. Protein intake and exercise have long been the standard defenses, though ageing muscle often responds less to protein than younger muscle does. The review positions gut bacteria as a possible third factor. One gut bacterium, found at lower levels in older adults, was linked to muscle strength in a study the review cites; when given to mice, it improved their grip strength and changed their muscle fibre composition.

Fermentation also produces short-chain fatty acids, compounds the review calls arguably the best-understood link between gut microbes and muscle. These help regulate inflammation, blood sugar, and energy use, and in lab experiments, one of them switched on muscle-growth signals and protected against muscle loss under diabetic conditions, according to the paper.

Also read: <a href="https://www.healthandme.com/nutrition/high-fibre-diet-outperforms-metformin-in-blood-sugar-control-and-weight-loss-study-finds-article-156367471" data-type="tilCustomLink">High-Fibre Diet Outperforms Metformin In Blood Sugar Control And Weight Loss, Study Finds</a>

<h2>What human trials actually found</h2>

Evidence gets thinner once research moves from mice to people. The review covers just three small human trials, and the results were modest.

In one trial, 48 middle-aged Korean men drank either fermented or regular whey protein twice daily for eight weeks alongside an exercise programme; the fermented group improved more in balance, but grip and back strength showed no meaningful difference, per the paper. A second trial gave 53 adults a protein drink made from kefir bacterium byproducts for 12 weeks; grip strength rose, but not enough to rule out chance, and since the drink used byproducts rather than actual kefir, the authors caution against generalising the result to everyday kefir. A third trial, in 18 young men, found that fermented milk reduced muscle soreness after a single intense workout, though long-term effects weren’t tested.

Separately, fermented dairy has shown some benefit for blood sugar and inflammation in people with type 2 diabetes or metabolic syndrome, though not consistently, and none of these trials checked whether such improvements reached the muscles themselves.

<h2>Probiotic pills currently have an edge</h2>

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The authors are clear that fermented foods and probiotic supplements aren’t interchangeable. Probiotic pills deliver precise doses of specific bacterial strains, making them easier to study, and several reviews of those trials report improved muscle strength and, in some cases, modest gains in muscle mass among older adults. 

Fermented foods are harder to standardise since their microbial content varies by starter culture, fermentation time, and storage. The review frames fermented foods as a complement to probiotics rather than a replacement, and flags older adults, athletes, and people recovering from injury as priority groups for future research.

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A spoonful of yogurt or a sip of kefir is usually sold as a gut-health food. A new scientific review asks whether the bacteria in these foods might also help keep muscles strong as people age.What the review looked atPublished in Communications Biology, a Nature Portfolio journal, the review was written by Dominic N. Farsi, Paul D. Cotter, and Orla O’Sullivan, researchers affiliated with Teagasc Food Research Centre in Ireland, APC Microbiome Ireland, and King’s College London, according to the paper. The authors examined lab, animal, and human research on what’s called the gut-muscle axis, a two-way chemical communication network between gut bacteria and muscle tissue. Gut bacteria release byproducts that travel through the bloodstream and may influence muscles, while exercise sends signals back that can alter the gut, the review explains.Their overall take mixes genuine interest with caution: the biological mechanism looks plausible, but solid proof that fermented foods actually build or strengthen human muscle is still missing.Also Read: High-Fibre Diet Outperforms Metformin In Blood Sugar Control And Weight Loss, Study FindsWhy muscle loss matters, and where gut bacteria fit inBeyond movement, muscle helps regulate blood sugar. Losing it with age, a condition called sarcopenia, is linked to frailty and loss of independence, the authors note. Protein intake and exercise have long been the standard defenses, though ageing muscle often responds less to protein than younger muscle does. The review positions gut bacteria as a possible third factor. One gut bacterium, found at lower levels in older adults, was linked to muscle strength in a study the review cites; when given to mice, it improved their grip strength and changed their muscle fibre composition.Fermentation also produces short-chain fatty acids, compounds the review calls arguably the best-understood link between gut microbes and muscle. These help regulate inflammation, blood sugar, and energy use, and in lab experiments, one of them switched on muscle-growth signals and protected against muscle loss under diabetic conditions, according to the paper.Also read: High-Fibre Diet Outperforms Metformin In Blood Sugar Control And Weight Loss, Study FindsWhat human trials actually foundEvidence gets thinner once research moves from mice to people. The review covers just three small human trials, and the results were modest.In one trial, 48 middle-aged Korean men drank either fermented or regular whey protein twice daily for eight weeks alongside an exercise programme; the fermented group improved more in balance, but grip and back strength showed no meaningful difference, per the paper. A second trial gave 53 adults a protein drink made from kefir bacterium byproducts for 12 weeks; grip strength rose, but not enough to rule out chance, and since the drink used byproducts rather than actual kefir, the authors caution against generalising the result to everyday kefir. A third trial, in 18 young men, found that fermented milk reduced muscle soreness after a single intense workout, though long-term effects weren’t tested.Separately, fermented dairy has shown some benefit for blood sugar and inflammation in people with type 2 diabetes or metabolic syndrome, though not consistently, and none of these trials checked whether such improvements reached the muscles themselves.Probiotic pills currently have an edge      The authors are clear that fermented foods and probiotic supplements aren’t interchangeable. Probiotic pills deliver precise doses of specific bacterial strains, making them easier to study, and several reviews of those trials report improved muscle strength and, in some cases, modest gains in muscle mass among older adults. Fermented foods are harder to standardise since their microbial content varies by starter culture, fermentation time, and storage. The review frames fermented foods as a complement to probiotics rather than a replacement, and flags older adults, athletes, and people recovering from injury as priority groups for future research.