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LifeNet Health Wins "Best Randomized Controlled Trial" Award for Diabetic Foot Ulcer Study
/PRNewswire/ -- LifeNet Health, a global leader in regenerative medicine, has received the Best Randomized Controlled Trial Award at the 2026 CAMPs Awards for...
Studying human-robot interaction, CWRU researcher explores tech-enabled mental health support | CWRU Newsroom | Case Western Reserve University
Editor’s note: Jasmine Vo, the author of this story, is a student employee in the University Marketing and Communications department. She is a fourt...
Number of AI chatbots ignoring human instructions increasing, study says
Exclusive: Research finds sharp rise in models evading safeguards and destroying emails without permission
Scientists train to dive beneath polar ice as climate change warms the Arctic and Antarctica
Scientists are learning to dive beneath polar ice and study the study the flora and fauna below.
City Council holds entertainment zone study session
Music lovers at this year’s CreekWalk Concert Series may find more options to quench their thirst, as the Vacaville City Council held a study session regarding Entertainment Zones on Tuesday. Associate Planner Damiere Powell provided the…
Can pesticide exposure before pregnancy affect babies’ health?
A new study suggests a correlation between certain chemical compounds and lower newborn health scores.
One type of alcoholic drink linked to lower death risk, study finds
While experts advise avoiding alcohol altogether, a new study says that, among those who imbibe a low or moderate amount, there is a decrease in serious health risks and one type of alcoholic drink…
UVA Health study raises concerns about kratom use in the United States
A new UVA Health study is raising concerns about a substance that is widely available in stores across the country.
To assess AI in health care, study the human-machine team
AI health care tools appear to have a reliability problem, and experts suggest a new way of evaluating them.
More concussions equal worse brain health 5 years after college sports
New concussion study deviates from the norm; most research in this space examines people in their 50s or 60s — decades after sport participation. Instead, this U-M study looks at college athletes in their 20s, and researchers already see the impact of concussion, which enables early intervention.
Portland keeps losing legacy businesses. Could a new program be the solution?
A majority of business owners surveyed for the study expressed support for the program, according to the report.
Sperm get lost in space, Australian research into microgravity impacts suggests
Study into how fertilisation could work in space finds sperm may get disorientated when trying to find an egg
Glass Threads Spun From a Volcano’s Bubbly Magma
A volcanic formation known as Pele’s hair is produced when air-filled magma is stretched, according to a new study by a team of scientists and glass artists.
Health Insurance May Slow Toxin-Related Aging
A new study found that people with health insurance showed fewer signs of biological aging than those without coverage.
Scientists Finally Figured Out the Math Behind How You See Color
The team behind the study created what might be the most accurate mathematical representation of photoreception ever.
Scientists Finally Figured Out the Math Behind How You See Color
The team behind the study created what might be the most accurate mathematical representation of photoreception ever.
Scientists may be overestimating the amount of microplastics in the environment – and the culprit is lab gloves
Tiny particles from certain lab gloves look like microplastics, and they can contaminate samples, new study finds.
Scientists may be overestimating the amount of microplastics in the environment – and the culprit is lab gloves
Tiny particles from certain lab gloves look like microplastics, and they can contaminate samples, new study finds.
Small Daily Habits Can Add Up To Better Heart Health
By Dennis Thompson HealthDay ReporterTHURSDAY, March 26, 2026 (HealthDay News) — Even small improvements to your daily habits – a few minutes more sleep, a couple extra minutes of exercise, a daily side serving of veggies – can lower your risk of heart attack, stroke and heart failure, a new study ...
Trunk show: Elephants roam the human imagination in EcoTarium exhibit
Elephants are a study of grace, beauty and strength, but they face threats, mainly from humans. An exhibit at the EcoTarium their world, and ours.
San Diego scientists discover gene in plants that could slow drought impacts
Research from San Diego's The Salk Institute for Biological Studies could soon protect crops from drought all around the world. A recently published study says drought directly impacts the rate at which plants age.
Scientists Say This Hellish “Day-Night” Planet May Support Life
A new study suggests that even the most extreme exoplanets might not be entirely inhospitable.
NASA-Supported Study Finds Irrigation Gaps in Air Quality Forecasts
Computer models used to forecast air quality may have gaps when it comes to farmland, according to a newly published NASA-supported study that compared
Chinese lander reveals giant 'cavity' of radiation between Earth and the moon — and it could change how lunar exploration is done
A new study using data from China's Chang'e-4 moon lander found an area of reduced radiation from cosmic rays near the moon. The findings could be used to improve the safety of lunar explorations.
UT Health San Antonio launches clinical trial to study rapamycin and healthy aging - UT Health San Antonio
Contact: Eileen Teves, 210-450-7239, tevese@uthscsa.edu Content provided by Claire Kowalick SAN ANTONIO, March 25, 2026 – UT Health San Antonio, the academic health center of The University of Texas at San Antonio (UT San Antonio) is launching a multi-phase clinical study to better understand how the drug rapamycin may promote healthy aging. Funded by the National […]
Glyphosate: A story of science, risk, and nuance
In the summer of 2014, a California groundskeeper named Dewayne Johnson started noticing patches of raw, weeping skin spreading across his body. He had spent years applying Roundup, Monsanto’s glyphosate-based herbicide, for a school district, sometimes drenched in it when equipment malfunctioned. By 2014, he had a diagnosis: non-Hodgkin’s lymphoma. In 2018, a jury awarded him $289 million in damages, later reduced on appeal. Tens of thousands of lawsuits followed. The story hasn’t quieted down. It’s all over the internet, swinging between “this will kill you, buy organic” and “relax, you’re fear-mongering.” Some of that recent chatter stems from an Executive Order protecting glyphosate and its production, which set off intense infighting within the MAHA movement. Some of it reflects a deeper truth: Americans genuinely care about harmful chemicals in their environment (see poll below). And the conversation isn’t going anywhere, with a Supreme Court case involving Monsanto set for this April. Glyphosate (the active ingredient in Roundup) is one of the most widely used herbicides in the world. But does glyphosate cause cancer? And how much exposure is actually risky? With so much mistrust in institutions and corporations (and some genuine conflicts of interest), making sense of the actual scientific evidence is genuinely hard. Here is a translation of what the scientific evidence actually says. Does glyphosate cause harm? Glyphosate is an herbicide that kills most plants it contacts rather than targeting specific species. It works by blocking an enzyme pathway (EPSPS) that plants and many microorganisms need to produce essential amino acids. Without those amino acids, the plant can’t grow and dies. Glyphosate was first developed by Monsanto in the 1970s and became ubiquitous after the company introduced “Roundup Ready” crops in the 1990s. In 2024, Bayer removed glyphosate from residential Roundup-branded products due to litigation pressure. But today it is still the most widely used herbicide in the world. Farmers also discovered they could spray it directly on crops like oats, lentils, beans, and peas just before harvest to dry them out faster and make harvesting easier. Because of its widespread use, it’s obviously really important to understand if it’s harmful to humans. The key principle: The dose makes the poison The most important concept in toxicology is that “the dose makes the poison.” Sixteenth-century physician Paracelsus articulated what remains the foundational principle of toxicology: sola dosis facit venenum. Water will kill you if you drink enough of it. Aspirin saves lives at 81 milligrams and causes internal bleeding at higher chronic doses. So, at what dose is glyphosate poisonous? The LD50 in rats (the dose that kills half the test animals) is around 5,600 mg/kg body weight. Table salt is roughly 3,000 mg/kg. By that classic measure, glyphosate is less acutely toxic than salt. But some people are exposed to a lot of glyphosate through their work. And among the general public, there are many questions about low-dose, cumulative exposure from multiple sources over long periods. Does glyphosate cause health problems? Cancer Correlation maps are striking, with one analysis finding that 60% of counties that spray the most glyphosate have non-Hodgkin’s lymphoma rates above the national average. But correlation alone doesn’t establish cause, which is why animal and human studies matter. In animals: Rat studies are typically what most fear is rooted in, but most people don’t know the study details on the dosage given to rats. A pooled analysis of the 13 most rigorous rat studies found evidence that very high doses, around 55,000 times greater than typical food residue exposure, can cause certain cancers. In humans: One of the strongest studies followed 55,000 herbicide users over 20 years and found no overall increased cancer risk. There was one signal: among those with the highest use, rates of acute myeloid leukemia (AML) appeared elevated. A broader meta-analysis of 18 human studies also found no overall cancer risk, though a separate meta-analysis focused specifically on non-Hodgkin lymphoma found that people with high cumulative glyphosate exposure faced a 41% higher relative risk compared to those with low or no exposure. These human studies are observational studies (randomized controlled trials would be unethical), and meta-analyses are only as reliable as the studies they pool. But the story seems consistent: at very high exposure levels, there may be some cancer risk. But that’s about as far as the science currently takes us. Emerging research: gut and reproductive health Gut: Because glyphosate targets a pathway that exists in some gut bacteria, scientists have questioned whether it could affect the microbiome. In mice, a 2023 University of Iowa study found that glyphosate altered gut bacterial composition and raised markers of intestinal inflammation. A 2024 systematic review found similar patterns: disrupted gut bacteria and problems with the mucus layer that protects the intestinal wall in mice. Whether this translates to humans is an open question. The human gut is highly variable and resistant, and we don't yet have strong studies confirming the same effects in people. Reproductive health: Animal studies have found that glyphosate-based herbicides can interfere with reproductive hormones, including disrupting egg cell development in mice and reducing the number of eggs available in sheep’s ovaries. However, the doses used in these experiments were high, so it’s not yet clear whether the same effects would occur in humans. On the human side, a 2021 pilot study led by Mount Sinai researchers tested urine samples from pregnant women across the U.S. and found glyphosate in 95% of them. The study also found a possible connection between higher glyphosate exposure during pregnancy and a subtle physical difference measured in female newborns. That said, some connections weren’t statistically reliable and this was a small study. The researchers themselves said more and larger studies are needed before drawing firm conclusions. What do regulators say about glyphosate safety? In 2015, the International Agency for Research on Cancer (IARC), part of the World Health Organization, classified glyphosate as "probably carcinogenic to humans" (Group 2A). The classification is worth taking seriously. But, there’s an important distinction: IARC classifies hazard, meaning the potential to cause harm under some conditions. It does not assess risk, which accounts for actual exposure levels and the real-world probability of harm. The U.S. EPA, the European Food Safety Authority, Health Canada, and regulatory agencies in Australia and Japan have all concluded that glyphosate is “unlikely to be carcinogenic to humans” at realistic exposure levels. They’re asking a different question: given how much of this people actually encounter, what is the probability of harm? Your actual exposure is what determines your actual risk. What does glyphosate mean for your daily life? At the grocery store: Food residues are small. The EPA’s acceptable daily intake is 1.75 mg/kg of body weight per day. To hit that threshold from oatmeal alone, a 150-pound adult would need to eat roughly 50 pounds of oats every day. But this calculation addresses only one pathway (food), and we don’t yet have robust tools to measure people’s actual total exposure. If reducing exposure matters to you, organic certification prohibits synthetic herbicides, and organic oat products generally test at lower or undetectable levels. Either way, a diet rich in whole grains, conventional or organic, is far better for your health than one that omits them out of fear of residues. On the farm: Occupational exposure is orders of magnitude higher than consumer exposure. Farmers and farm workers who mix, load, and apply glyphosate-based herbicides, especially without protective equipment, face meaningfully different risk profiles. Proper PPE isn’t optional. Integrated weed management strategies that rotate chemical modes of action are also worth taking seriously, both for health and for long-term effectiveness. If you live near a farm: Spray drift is real. Concentrations near field edges can spike during and after application, particularly on windy days. This is an area where I think public health could really step up and empower rural communities with buffer zones, rather than placing the onus on individuals. But for now, knowing your local agricultural calendar and keeping windows closed during application are the first steps. Bottom line Dewayne Johnson was exposed to glyphosate at levels most people will never encounter, and a jury decided he deserved compensation. That outcome is not evidence that the oatmeal in your pantry is dangerous. But it is a reminder that the dose, the context, and the person doing the exposing all matter enormously. Glyphosate is a chemical tool with benefits, trade-offs, and genuine open scientific questions. Learning to hold that complexity without collapsing into panic or dismissal is, honestly, one of the most useful and hardest things to do in navigating modern health science. Love, YLE Your Local Epidemiologist (YLE) is founded and operated by Dr. Katelyn Jetelina, MPH PhD—an epidemiologist, wife, and mom of two little girls. Hannah Totte, MPH, is an epidemiologist and YLE Community Manager. YLE reaches more than 425,000 people in over 132 countries with one goal: “Translate” the ever-evolving public health science so that people will be well-equipped to make evidence-based decisions. This newsletter is free to everyone, thanks to the generous support of fellow YLE community members. To support the effort, subscribe or upgrade below: Subscribe
Want To Protect Your Brain? Science Says Exercise
By HealthDay Staff HealthDay ReporterWEDNESDAY, March 25, 2026 (HealthDay News) — Lunges and squats may do more for the brain than previously thought, including helping protect it from damage tied to aging and dementia, a new study suggests. In research published this month in the journal Cell,
Effectiveness of politicians’ public denials amid corruption accusations examined in new study
A new article investigates how public denials by politicians accused of corruption influence electoral accountability and why positive and negative partisanship shapes voter reactions.
Health Rounds: Fake X-rays created by AI fool radiologists and even AI itself
Fake X-ray images created by artificial intelligence to resemble true results from human patients can fool not only experienced radiologists but also the AI tools themselves, according to a study that illustrates the potential for manipulation by bad actors.
How magnetic is the moon? A new study cracks the long-standing mystery
Researchers believe rock samples taken from the Apollo missions gave scientists a misleading impression
This Unique Diet Could Slow Your Brain Aging by Over 2 Years, Study Suggests
Food for thought.
Talking about politics at work may support employee well-being, study finds
In an era of nonstop headlines and growing political division, many workplaces still follow a familiar rule of thumb: Don't talk politics at work. New research from Washington State University suggests ...
Rowing Science: Hit the Bench Pulls and Dead Lifts, Skip the Squats
A study of German national team rowers found a high correlation between 2000m speed on the erg and o
Your Poop Schedule Says a Lot About Your Overall Health, Study Reveals
It matters more than you think.
UT Health San Antonio Multispecialty and Research Hospital treats first clinical trial participant in novel cancer study - UT Health San Antonio
Milestone paves the way for advancements in cancer care, innovation and patient care in San Antonio and South Texas. UT Health San Antonio Multispecialty and Research Hospital has enrolled and treated its first clinical trial participant in a novel cancer study, marking a pivotal moment for science and patient-centered cancer care in San Antonio and […]
Mouse study shows repeated cloning causes grave genetic mutations
1,206 cloned laboratory mice were generated by the scientists from a single female donor mouse from 2005 to 2025 in research conducted in Japan.
Can Treating Peyronie’s Disease Improve Mental Health?
A University of Miami Miller School study explores how treatment for Peyronie’s disease may improve depression, anxiety and quality of life.
Scientists Develop New Gut Health Measure That Tracks Disease
Scientists have identified a new way to distinguish healthy guts from diseased ones and track how some illnesses progress by measuring how gut bacteria interact with one another. According to a study published in Science, a Rutgers-led team of scientists found that healthy and diseased digestive systems behave like two distinct ecological states, driven not by individual microbes but […]
Why going to an HBCU might be better for Black students’ health
A study found correlation between the environment and long-term wellness in sample of 1,978 who attended college between 1940-80
Talking politics at work may support employee well‑being
Study challenges the conventional wisdom about avoiding talking politics at work, showing that it can sometimes benefit employee well-being.
These Creatures Have One Cell and No Brain. Scientists Just Discovered They Can Learn.
In 1897 Russian physiologist Ivan Pavlov proved that animals can be trained using associative learning. A new study finds that even single-celled organisms can behave like “Pavlov's dog.”
Highly and casually active citizen scientists contribute equally valuable data
A new study shows that contributions from both highly and casually active citizen scientists can be equally valuable and — in some cases — even complement each other.
New Fathers Face Mental Health Challenges, Study Finds
By Dennis Thompson HealthDay ReporterTUESDAY, March 24, 2026 (HealthDay News) — New fathers might be proud poppas, but their mental health might be shaky as they adapt to their increased responsibilities, a new study says. Men have a 30% increased risk of depression and stress disorders by the end ...
Scientists take antimatter on first road trip as they study how to transport ultra-sensitive cargo
Scientists at CERN are taking some antiprotons out for a spin in a never-tried-before test drive.
Stopping GLP-1 drugs like Ozempic erodes heart health benefits quickly, new study finds
Stopping GLP-1 drugs like Ozempic quickly erodes heart protection, with two years off the medication raising cardiovascular risk by 22%, a new study finds.
Mediterranean diet may boost mitochondrial signals linked to heart and brain health
A study led by researchers at the USC Leonard Davis School of Gerontology suggests that the benefits of the Mediterranean diet may be driven, in part, by tiny proteins hidden within our mitochondria, ...
Can pesticide exposure before pregnancy affect babies’ health?
A study co-authored by UCLA researchers suggests certain chemical compounds correlated with lower newborn health scores.
A geneticist is studying pythons for clues about human health and longevity
A team of researchers believes that pythons may contain clues to help treat a range of human ailments — from heart disease to muscle atrophy, and more.
Science Through Shadows: How Astronomical Alignments Reveal the Universe
When one celestial object passes in front of another, it can cast a shadow that travels across space – and sometimes across Earth. These moments of alignment, known as eclipses, occultations, and transits, allow scientists to study distant objects in remarkable ways. By observing how light changes when an object briefly blocks another, astronomers can measure sizes and shapes, detect atmospheres, and refine the orbits of asteroids and planets.
NIH grant terminations affected women scientists more than men, study finds
A new paper shows that women, particularly those early in their careers, have been disproportionately affected by NIH grant terminations
Antarctica could warm 1.4 times faster than the rest of the Southern Hemisphere in the coming decades, study finds
Antarctica could warm much faster than its surroundings over the next few decades due to a phenomenon known as polar amplification that is well established in the Arctic.
Finishing a video game can trigger “post-game depression,” study finds
Post-game depression is now being studied as a measurable phenomenon, with researchers identifying how finishing a video game can leave players feeling empty, reflective, and emotionally drained.
How Will Gravity on Mars Affect Humans? A New Study Reveals a Clue.
Maintaining muscle mass is key.
New York approves cannabis for anxiety. Science says it may not help
A Lancet Psychiatry study found no evidence cannabinoids treat anxiety, PTSD. In NY, any practitioner can certify a patient for medical cannabis for any condition they deem appropriate.
Volunteer US and UK fighters in Ukraine face hidden health crises, new study suggests
Former soldiers who have served as volunteer fighters in Ukraine experience high levels of mental and physical health difficulties yet are rarely able to access the health care they need, either during ...
Turning coal to medicines: Chinese scientists bring a 160-year-old dream to life
Study cracks a puzzle that has baffled scientists and will reshape modern medicine production as the world reels from a global oil shortage.
A promising fatty liver treatment may raise cancer risk
A surprising new study reveals that blocking a supposedly protective enzyme, Caspase-2, could actually backfire—raising the risk of chronic liver damage and cancer over time. Researchers found that without this enzyme, liver cells grow abnormally large and accumulate genetic damage, leading to inflammation, scarring, and eventually tumors, especially with age. While inhibiting Caspase-2 may offer short-term benefits, such as reducing fatty liver disease, the long-term consequences appear dangerous.
Your Thymus and Your Healthspan
Our thymus gland plays a central role in the development or our immune system, specifically for supporting T cell development (how these cells got their name, maturation and differentiation in the thymus) and discriminating between self and foreign, non-self antigen proteins with production of dendritic cells. As we age, our thymus gland shrinks—the process known as involution—with progressive change from spongy to fatty tissue, with loss of functionality. But this process, with respect to timeline and extent, markedly varies from one person to the next. And to make things even more complicated, our thymus gland anatomy and precise location in the chest also is highly variable. So the famous Frank Netter diagrams from the 1960s (such as at left below) don’t capture the remarkable heterogeneity that a random set of 12 chest CT scans (below at right). What I consider as 2 landmark papers in Nature this week (here and here) used AI to quantify health of the thymus in 2 large cohorts, and then correlate the metric to a broad array of health outcomes. In this edition of Ground Truths, I’m going to cover three questions: (1) How was thymus health determined by AI?; (2) How is thymus health linked to key clinical outcomes? and (3) Are there ways we can promote a healthy (aka rejuvenate) thymus gland in our later years? Subscribe 1. How was thymus health determined by AI? This was accomplished by extensive work developing and validating an AI pipeline for 2 stages, the first for localization and segmentation of the thymus bed, and the second to quantify a digital marker, termed the thymic health score. There’s a lot to this algorithmic development, so I won’t go into all the details, but just provide a rudimentary outline of what was done. The 1st stage used supervised learning with 2 radiologists reviewing 2,461 chest CT scans. That work trained a 3D U-Net model to automatically identify the thymic bed’s 3D cropped region using center of mass coordinates, which reached 99.8% accuracy. The 2nd stage used a foundation model that was pre-trained with SwAV (which stands for Swapping Assignment between multiple Views), a self-supervised model, that generated a high-dimensional thymus representation of 4,096 features. That compares to the radiology reductionist and subjective scoring of 0 to 3 where 0 means the thymus is fully degenerated and fatty, and 3 is considered dense, intact glandular soft tissue. Notably, the self-supervised learning (SSL) performance was superior to supervised (AUC ~0.75 vs 0.55, respectively) reflecting the shallowness of the 0-3 classifier vs SSL’s holistic, self-taught AI. The thymic health score ranged from 0 to 100, with the highest number indexed to fully preserved thymic health. The algorithmic work extended to explainability with both Shapely value distribution, meaning the model was holistic not relying on any “magic” pixel, and occlusion sensitivity, demonstrating the model’s performance was not affected by ribs, sternum, lung tissue, but rather focused on the thymic bed directly. Below are a few saliency maps from the occlusion sensitivity that indicate the thymic bed focus, not affected by neighboring structures, using the jet color scale. Now the AI was ready for processing ~25,000 CT scans, each over 30 MB files, from the 2 large participant cohorts to provide a thymic health score, it did so in less than 14 hours, which is less than 2 seconds per scan! Share 2. How is thymus health linked to key clinical outcomes? The two cohorts were the National Lung Screening Trial, NLST (N=25,031) and the Framingham Heart Study, FHS (N=2,581) each with baseline demographics and long term follow up of >12 years for health outcomes. From the NSLT, you can see below that increased age and body-mass index were correlated to reduced thymic health. And, overall, men had reduced thymic health scores compared with women. There are a lot of graphs in the paper for outcomes, for both the NLST and FHS cohorts. To simplify the major outcomes, below is a composite Figure with striking reduction of all-cause mortality and for the different causes of death. The results were consistent between the 2 cohorts. For example, the cardiovascular mortality hazard ratio average was 0.57 in NLST and 0.38 in FHS (weighted to be 0.53 for the aggregate). The reduction of mortality also extended to digestive diseases and pulmonary disease (data not shown below). Lung cancer incidence was reduced by 36% for high vs low thymic health (Figure below, with a panel -incidence and b panel-mortality, adjusted for age, sex, BMI, smoking status). Notably, there was a smoker’s paradox: lower incidence and improved survival for lung cancer in smokers who had a high thymus health score. Smoking was associated with lower thymic scores whereas alcohol was not. Higher thymic health was linked to higher HDL cholesterol, lower triglycerides, lower fasting blood glucose, and lower systolic and diastolic blood pressure. Inflammation biomarkers, such as C-reactive protein and interleukin-6, were elevated in the people with lower thymic health scores. In their second paper, the same team looked at the relationship between thymic score and outcomes for 3,476 patients receiving cancer immunotherapy. The non-small cell lung cancer progression-free survival was reduced in patients with low thymic health score. A parallel relationship for survival was seen for other types of cancer including melanoma, breast, and kidney with a 44% lower risk among high thymic scores (Figure). A similar pattern was seen with different immune checkpoint inhibitors. The thymus health score outperformed programmed death ligand-1 (PD-L1)and tumor mutation burden (TMB) assay of the tumor and was an independent prognostic marker of progression-free survival. In this dataset, a direct connect with thymus score and adaptive immune function was noted with a correlation before cancer treatment for both T-cell diversity and thymus T-cell production (a metric known as T cell receptor excision circles). Thymus Removal Study There is a highly relevant citation about thymus function before moving onto ways to rejuvenate it. In 2023, a very important study of thymus removal during cardiothoracic surgery was published, with 1146 patients undergoing thymus removal vs 1146 matched controls (mean age 55 years). The adverse outcomes for thymus removal were striking, with a 2.9 higher risk of all-cause mortality and doubling of cancer incidence, 1.5 fold increase in cancer mortality, and 1.5-fold increase in autoimmune diseases. The immune function showed marked compromise after thymus removal, as reflected by CD4+ and CD8+ T cells (Figure below) Share Ground Truths 3. Are there ways we can promote a healthy (aka rejuvenate) thymus gland in our later years? In recent months we’ve learned a lot about the process of thymus involution and the pathways by which this may be modulated. Thymus involution is primarily due to loss to thymus epithelial cells (TECs) and there are 2 subtypes with different functions: the cortical, responsible for positive selection of T cells, and the medullary, for negative selection. When adipose tissue infiltrates the thymus, thymic adipocytes are pro-inflammatory, knocking out T-cell output. Likewise, systemic inflammation, or “inflammaging,” from smoking, obesity, and chronic stress promote thymic adipocytes. Now, from preclinical studies, we know about key pathways that account for these processes. Historically, back in 2014, FOXN1 was recognized as a single master transcription factor essential for TEC function, with studies in mice with forced FOXN1 upregulation leading to thymus regeneration. That laid the foundation for potential regrowth of quiescent thymus cells. It took awhile to find pathways to accomplish this goal and to even refute its role as the master regulator. The Liver-Thymus Axis Feng Zhang and his team recently showed that injection of an mRNA vaccine to the liver encoding DLL1, IL-7 and FLT3-L in combination, factors known to support thymopoiesis (Figure), successfully enhanced immune function in aged mice. However, the effect was transient. The FGF21 Story Two reports in 2025 addressed the thymus gland’s production of FGF21, a growth factor (fibroblast growth factor 21) and its control of thymus involution. This growth factor is also produced by the liver, but it doesn’t have impact on the thymus in aged rodent models. In contrast, The liver’s hepatocyte growth factor (HGF) has been shown to reverse senescent TEC structural changes. Growth hormone stimulates production of insulin growth factor-1 (IGF-1) in the liver and the thymus. Two small studies in human participants (TRIIM, for Thymus Regeneration, Immunorestoration, and Insulin Mitigation) of 6 and 50 people, respectively, treated with combined human growth hormone, metformin and DHEA, suggested the potential of slowing epigenetic aging and improving thymus mass and function. But the combination of drugs, small sample, and lack of controls make conclusions murky. Increased thymus FGF21 led to increased CD8 T cells in old mice and extended healthspan and improved physical performance. Building on the previous FOXN1 data, ablation of β-klotho, the obligatory co-receptor for FOXN1, accelerated thymic aging. The benefit to FGF21 was confirmed in a companion paper using an FGF21 knock-in mouse model showing thymus enlargement and increased TECs throughout the lifespan. (schematic Figure below). The accompanying editorial for these 2 papers speculated: “The proposed link between age-associated thymus involution and organismal aging is intriguing, and suggests we might seek to achieve systemic rejuvenation by counteracting thymic involution.” Other Factors Lessons from the Axolotl (Mexican Salamander) In an elegant set of experiments of the axolotl (Figure), known for its complete thymus regeneration after total surgical removal, mediators were identified. Surprisingly FOXN1 was dispensable. But midkine, a growth factor, appeared to be the driver, the initiator of thymus cell growth, survival, and repair. Other components that contributed were Postn+ (periostin-expressing mesenchymal niches) and Ccl19, a chemokine protein from the bloodstream. RANK and RANKL RANK (receptor activator of nuclear factor κB its ligand (RANKL) have been considered key regulators of medullary TECs. In a study of both aged mice and human thymus cell cultures, their key role was confirmed, with multiple benefits of resorting TEC function, recruitment of progenitor cells, and T cell development. Subscribe Summing Up This body of work strongly supports the health of the thymus gland as a critical regulator of human healthspan, not just a correlate or link. The new landmark studies are reinforced by the regenerative biology experimental models that have shown, via an array of mediators, that healthspan of aged mice is at least in part dependent on thymus gland function and its critical role for maintaining adaptive immunity. It sure seems that we’d be better off having an immune reservoir of naive T cells instead of a profile in older adults of exhausted, low quality, memory T cells, with a senescent phenotype. It is striking that we ignored the importance of the thymus gland for many decades. A wake-up call was the results of the thymectomy matched control study reviewed here, with the opposite of high thymic health score improved health outcomes. The convergence of AI and healthspan here is notable. The exceptional and laborious work for developing and validating (no less explaining) the AI to quantify thymus health set the foundation for probing the connect the major health outcomes in two cohorts with extensive follow-up. We’ve never had a way to meaningfully quantify the thymus gland before, so this represents important leverage of supervised, self-supervised, and transformer models. The study wouldn’t have been possible without AI. And it begs the question as to whether there are ways we can maintain our thymus at a high health score. But it’s not so simple to rejuvenate our thymus. There are multiple risks including the induction of autoimmunity, increasing the risk of cancer, and inducing a pro-inflammatory state. For example, factors that increase TEC proliferation could compromise the medulllary negative selection process and leak out auto-reactive (self-attacking) T cells. Thymic cells could be induced to proliferate, but we know, for example, that growth hormone and IGF-1 are associated with an increase risk of cancer. If thymus rejuvenation doesn’t clear out the accumulated senescent cells in older adults, then inflammation within the gland could block the production of TECs. Keeping these risks in mind, we now have identified many ways to keep our thymus healthy as we age that undoubtedly will be tested in clinical trials going forward. Ultimately, the benefit-to-risk tradeoffs will be defined. In the meantime, we have desperately needed an immunome. As I’ve stressed in multiple prior Ground Truths, we have no test in the clinic to assess a patient’s immune status! It was very encouraging for me to get an email from Hugo Aerts, the senior author of the landmark papers in the days after they were published: “I also wanted to say that your Substack on “Why We Need an Immunome” was inspiring for this work. We found it a very compelling perspective and greatly enjoyed reading it.” Just having an assessment of a person’s immune status via a chest CT scan, with millions of these performed per year, might help in guiding the right immunotherapy for cancer (e.g. more intensive, combinations for those with low thymic health scores) and help define people who are increased risk for age-related diseases of cancer, cardiovascular, and neurodegenerative. The main theme of Super Agers is that we now have many layers of data (genetics, proteins, biomarkers, organ clocks that can be integrated via multimodal AI) for us to define a person’s specific risk decades before one of these age-related diseases leads to symptoms, enabling prevention. From the new studies this week, we can add thymus health score as yet another way to understand a person’s risk, a window into their adaptive immune system and healthspan. And perhaps someday we will be able to safely rejuvenate the thymus, or maintain its health through one’s life, and use the thymus health score to monitor. NB: I wrote this post (No A.I.) A Quick Poll Loading... ********************************************************************* Thanks to Ground Truths subscribers (now > 200,000) from every US state and 212 countries. Your subscription to these free essays and podcasts makes my work in putting them together worthwhile. Please join! If you found this interesting PLEASE share it! Share Ground Truths Paid subscriptions are voluntary and all proceeds from them go to support Scripps Research. They do allow for posting comments and questions, which I do my best to respond to. Please don’t hesitate to post comments and give me feedback. Let me know topics that you would like to see covered. Leave a comment Many thanks to those who have contributed—they have greatly helped fund our summer internship programs for the past two years. It enabled us to accept and support 47 summer interns in 2025! We aim to accept even more of the several thousand who will apply for summer 2026.
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