GLP-1s Extend Life Span, New Research Suggests. Could They Be Key to Human Longevity?

4 min readHere’s what you’ll learn when you read this story:GLP-1s, or glucagon-like peptide agonists, are a class of medication that is typically prescribed to manage type 2 diabetes and obesity. A recent study found that semaglutide, a type of GLP-1, extended the life span of mice by 12 percent. The findings add to a body of work that suggests GLP-1s may slow the root cause of aging, but the real question is: Should we be focused on life span—or another measure of health entirely? Roughly 11 percent of American adults are on a GLP-1 for weight loss, according to a 2026 Gallup survey; so chances are, you likely know someone who is using one for diabetes management, obesity treatment, or heart health—but the benefits might not stop there. Now, semaglutide, the popular GLP-1 medication found in Ozempic and Wegovy, is drawing serious attention from longevity experts.A recent study published in Nature found that semaglutide administered to female mice late in life significantly extended their life span. The results pose a legitimate question: Could GLP-1 drugs lengthen human lives as well?To understand whether GLP-1s have anti-aging benefits, researchers put mice that were 20 months old—or roughly 60 human years—on a semaglutide regimen for the rest of their lives. There was also a control group of female mice the same age that received saline injections instead of the semaglutide. The team targeted older, non-obese, non-diabetic female mice to minimize the effects of male aggression and injury, consistent with previous long-term aging research, according to study author Danica Chen, PhD, professor of metabolic biology and nutrition at the University of California, Berkeley.The results? The median life span of the mice that received the GLP-1 drug increased from 742 days to 834 days, roughly a 12 percent extension. The researchers also saw reduced inflammation and preserved cognitive and muscle function in the GLP-1 group.But there’s a rub here: This study was done in mice, which are a far cry from human adults, meaning we don’t yet know the effects of GLP-1s on people—at least not yet. However, there has been research that suggests lower-calorie diets lead to longer life spans in humans. “The general cause of aging is accumulation of cellular damage,” Chen says. She explains that calorie restriction can reduce cell damage and improve the function of tissues (a group of similar cells working together to perform a specific task), both of which contribute to a longer life span.Michael Corley, PhD, associate professor of medicine at the University of California San Diego, thinks the Nature study is “important and exciting” because it looks beyond the established metabolic benefits of GLP-1 drugs and tests whether they can influence the biological aging process. (Biological age denotes how well the body is functioning on cellular and molecular levels, while chronological age refers to the number of years a person has been alive.)“The finding that semaglutide extended life span by approximately 12 percent in older female mice, while improving several measures of physical and cognitive function, adds important evidence to the emerging field of GLP-1 therapies as potential gerotherapeutics,” or treatments that target the root of aging, Corley says. In fact, Corley was involved in a separate study, published earlier this year in Nature Communications, that found that 32 weeks of semaglutide treatment improved multiple epigenetic aging clocks, including measures of biological age and the pace of aging.Findings presented at the 2026 Aging Research and Drug Discovery Meeting have also strengthened this emerging picture, Corley explains. Novo Nordisk, a Danish pharmaceutical company with locations around the world, reported that semaglutide improved measures of biological aging across multiple organ systems, including the heart and kidneys.Likewise, Eli Lilly, an American pharmaceutical company headquartered in Indiana, presented findings that tirzepatide—another GLP-1 medication, which is found in prescriptions like Mounjaro and Zepbound—positively influenced several epigenetic aging clocks, including organ-specific markers that measure the biological age of the heart, kidney, liver, and immune system.“Together, these independent observations suggest that GLP-1-based therapies may affect biological aging through multiple molecular pathways,” Corley says. “The new mouse study is particularly interesting because it extends these molecular observations to actual life span, while also demonstrating improvements in several hallmarks of aging.”So, could GLP-1 drugs actually extend the life span of humans? Corley thinks the more compelling opportunity isn’t necessarily extending life span, but extending health span—or the number of years people live in good health, free from chronic disease and disability.“Human life span has biological constraints, and it is unlikely that GLP-1 drugs alone will dramatically extend the maximum limits of human longevity,” he says. “However, by reducing the burden of cardiovascular disease, metabolic dysfunction, and other age-related conditions, these medications could help more people remain healthy and independent for longer, potentially increasing average life span without fundamentally changing the upper limits of human longevity.”However, improvements in biological aging don’t necessarily translate into longer lives, Corley cautions.“The critical next step is determining whether these molecular changes predict meaningful improvements in physical function, cognition, and resilience,” Corley says. “I think the greatest potential of GLP-1 therapies is not to push humans beyond the limits of longevity, but to help more people reach older ages while maintaining their health, function, and independence.”To find out whether or not GLP-1 drugs can eventually be used as a legitimate longevity tactic in humans, Chen says clinical trials in humans are an important next step. 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This Weapon Can Save It.October/November 2022Download HereThis issue is optimized for mobile/tablet viewing.It's also available on Apple News+.Featuring:➡ Can America's M1 Abrams Still Compete With China's and Russia's Latest Battle Tanks?➡ Inside the Final Minutes of the Concorde Disaster—and How It Doomed Supersonic Travel for Decades➡ How the Massive Cargo Ship Felicity Ace Sank, Taking $400 Million Worth of Exotic Supercars With It➡ I Turned My Old Gas-Guzzler Into a Zippy EV for $15,000August/September 2022Download HereThis issue is optimized for mobile/tablet viewing.It's also available on Apple News+.Featuring: ➡ Cosmic Secrets of the 17 Most Powerful Mega-Telescopes on Earth—and Beyond➡ Can the Air Force's Secret, Hypersonic Jet Reclaim the Skies From Russia and China?➡ For 50 Years, the Zodiac Killer's 340 Cipher Stumped the FBI—Then Three Amateurs Cracked the Code➡ America's Most Fearsome Howitzer Has Entered the War in UkraineJune/July 2022DOWNLOAD HEREThis issue is optimized for mobile/tablet viewing.It's also available on Apple News+.Featuring:➡ Every Single Drone Fighting in the Skies Over Ukraine➡ How to Buy a New Car in 2022 Without Getting Fleeced➡ This Megastructure Could Keep Us Alive Forever➡ The Race to Revolutionize EV BatteriesDanielle Zickl is a freelance writer who has 10 years of experience covering fitness, health, and nutrition. She's a graduate of Ithaca College. You can find her work here on Women's Health, and in many other publications including PS, SELF, Well+Good, Runner’s World, Outside RUN, Peloton, Men’s Fitness, and more.