Health
Everyday clues that your immune system is aging — and how to fight back
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Recent studies have shown that even if you feel healthy and fit, your immune system could be aging quicker than you think, which could increase the risk of infections and immune-related disorders.
“Immune aging, like all aging, means that our immune systems start to slow down, make more mistakes and be less effective at protecting us from infection as we get older,” Chris Rhodes, Ph.D., a nutritional biochemist and longevity expert in California, told Fox News Digital.
When the immune system ages, immune cells become less able to perform crucial functions like fighting infection, destroying cancer cells and healing wounds, according to Rhodes, who is also the CEO and co-founder of Mimio Health in San Francisco.
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“After the age of 35, our immune systems become less and less able to adapt to new antigens, allergens and other inflammatory stimuli — and our thymus, the organ responsible for producing T-cells, gradually shrinks, meaning our immunity and ability to respond to new infections becomes more compromised with age,” the doctor added.
Inflammation is a key driver of declining immune function, leading to what many experts call “inflammaging.”
While most people begin to experience “measurable immune decline” by their late 30s to early 40s, making certain lifestyle changes and boosting metabolic health can significantly delay it, experts say. (iStock)
“Low-grade inflammation accelerates many age-related diseases, from cardiovascular disease to neurodegeneration,” Dr. Pooja Gidwani, a double board-certified doctor of internal medicine and obesity medicine in Los Angeles, told Fox News Digital.
Signs of an aging immune system
Some signs that the immune system is slowing down include increased infections or colds, slower wound healing and diminished recovery from exercise or injury, according to Rhodes.
Fatigue, joint stiffness, aches and pains, recurrent viral flare-ups and a weaker vaccine response could also indicate a declining immune system.
5 ways to slow down immune aging
While most people begin to experience “measurable immune decline” by their late 30s to early 40s, making certain lifestyle changes and boosting metabolic health can significantly delay it, according to Gidwani.
“A youthful immune system isn’t about never getting sick — it’s about recovering quickly, regulating inflammation effectively, and preserving the energy and cognitive clarity that define long-term vitality,” she said.
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The experts shared the below strategies for slowing down immune system aging.
No. 1: Optimize nutrition diversity
Gidwani emphasizes the importance of nutrient diversity, not just healthy eating. She recommends incorporating a variety of plants, proteins and healthy fats daily.
“A wide variety of polyphenols, fibers and omega-3 fats nourishes the gut microbiome, which trains and regulates immune cells,” she said. “Because roughly 70% of immune tissue resides in the gut, microbial diversity directly predicts immune resilience.”
When the immune system ages, immune cells become less able to perform crucial functions like fighting infection, destroying cancer cells and healing wounds. (iStock)
Diet plays an “enormous role” in immune functionality and longevity, according to Rhodes, as the effects of certain foods can boost inflammation and lead to immune system stress. Over time, this can promote autoimmune disorders, contribute to disease progression and decrease longevity.
“The best way to keep your immune system youthful and happy is to focus on a diet rich in antioxidants, polyphenols and plant bioactives that have anti-inflammatory effects, as well as whole foods that avoid the glucose and lipid spikes that promote inflammation,” he advised.
Diet plays an “enormous role” in immune functionality and longevity.
Rhodes also recommends considering intermittent fasting to minimize the time the body spends in the “post-prandial (post-eating) state” and to benefit from “powerful anti-inflammatory effects.”
No. 2: Protect sleep and manage stress
Lack of sleep and chronic stress can cause immune cells to be more worn out, less effective at their jobs and more prone to making mistakes, according to Rhodes.
“Increases in cortisol caused by lack of sleep or high stress levels will promote immune system activation, which can be beneficial in the short term to avoid infection, but will lead to accelerated immune cell aging and less effective functionality over time,” he warned.
Experts recommend incorporating a variety of plants, proteins and healthy fats daily to boost immune function. (iStock)
“Ultimately, chronic activation of the immune system due to lack of sleep and high stress will burn out your immune cells faster and accelerate their aging.”
Sleep is the ultimate “immune modulator,” Gidwani said, as even one night of deprivation can cut “natural-killer-cell activity” by up to 70%.
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She recommends getting seven to eight hours of quality sleep nightly and cultivating a stable circadian rhythm.
Finding “intentional” ways to manage stress — such as journaling, meditating and spending time outdoors — can also help boost immunity.
No. 3: Get regular exercise
Exercise is known to strengthen immunity by lowering stress hormones, reducing chronic inflammation and helping immune cells move through the body.
Rhodes cautioned, however, that while exercise is essential to promoting long-term health and longevity, it can also be “pro-inflammatory,” as the damage done to the muscle during exercise also activates the immune system and causes inflammation.
“High-impact and intense-burst exercise like sprinting, HIIT training or heavy weight lifting will be the most inflammatory, as these typically cause the highest level of acute muscle and joint stress and promote cellular growth pathways associated with aging,” he said.
Exercise is known to strengthen immunity by lowering stress hormones, reducing chronic inflammation and helping immune cells move through the body. (Edward Bock)
Low-impact endurance exercise, like marathon running, hiking, swimming or biking, will typically cause less inflammation over time, helping to keep the immune system “functional and fresh” in the long term, Rhodes advised.
Gidwani recommends striving for a blend of aerobic (cardio) exercise and strength training to optimize mitochondrial health.
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“Consistent, moderate exercise enhances mitochondrial function and lymphatic flow, improving immune surveillance without promoting inflammation,” she said.
No. 4: Consider supplements (carefully)
Some supplements and newer interventions can help slow down immune aging, according to Gidwani.
“Core nutrients like vitamin D, magnesium, zinc and omega-3s remain foundational,” she said. “Beyond that, NAD⁺ boosters, senolytic compounds and select peptides — such as thymosin alpha-1 for immune modulation and BPC-157 for tissue repair — are promising adjuncts for supporting repair and lowering chronic inflammation.”
“Most people begin to experience measurable immune decline by their late 30s to early 40s, but lifestyle and metabolic health can delay it significantly.”
The doctor noted, however, that these supplements should complement, not replace, healthy lifestyle behaviors.
Rhodes suggested that while some vitamins and supplements are critical to immune function, the importance of these “has often been overhyped.”
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“While the immune system needs essential vitamins, minerals, proteins and fatty acids to function properly, taking high doses of these micronutrients will typically not add any additional benefit beyond avoiding deficiencies,” he said.
Some of the best supplements to take are those with anti-inflammatory effects, Rhodes said.
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“These can be compounds like EGCG from green tea, omega-3 fatty acids, anthocyanins from berries, and biomimetics like palmitoylethanolamide (PEA) and oleoylethanolamide (OEA) that recreate the body’s natural anti-inflammatory signaling.”
People should speak with a doctor before starting a new vitamin or supplement regimen.
No. 5: Foster connection
Research has shown that oxytocin, known as the “bonding” hormone, plays a role in regulating stress responses and inflammation, which can boost immune function.
“Physical touch, laughter and community raise oxytocin, lowering cortisol and systemic inflammation,” Gidwani said.
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One woman’s uncomfortable reaction to alcohol led to a grave discovery.
Hollie Thursby, 28, a mother of two from the U.K., told Kennedy News and Media that after giving birth to her second son, Jack, she began experiencing unusual symptoms.
At a checkup for her son, who was a couple of months old, Thursby mentioned that she was experiencing “unbearably itchy skin,” which is known to be a post-partum symptom. The doctor suggested it was due to changing hormones.
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Thursby added that she occasionally drank a couple glasses of wine. Although she kept the drinking to a minimum, she described having “a lot of pain” down the side of her neck.
“Really quite painful and uncomfortable,” she said, according to the report.
A U.K. mom reported experiencing pain in her neck after drinking a glass or two of wine, which turned out to be one of the first signs that she had cancer. (Kennedy News and Media)
The mother also reported feeling extremely exhausted, which she assumed was due to caring for her children throughout the day.
“I also felt like when I got to bed that someone was sitting on my chest,” she shared.
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In July 2025, Thursby discovered a lump on the side of her neck that she described as “really quite big,” but wasn’t painful, Kennedy News and Media reported.
“It was hard, it didn’t move, but it was there,” she said. “When I turned my neck to the side, you could see it.”
Thursby reportedly began chemotherapy for Stage 2 Hodgkins lymphoma. (Kennedy News and Media)
Thursby’s symptoms turned out to be a form of blood cancer — Stage 2 Hodgkins lymphoma, which means it is in two or more lymph nodes, according to Cancer Research U.K.
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Common symptoms include swelling of the lymph nodes, heavy sweating, weight loss, itching, persistent cough or shortness of breath, high temperatures, and pain in the stomach or lymph nodes after drinking alcohol.
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“Pain when you drink alcohol is actually a known side effect of Hodgkin lymphoma,” she said, per the report. “It’s something about the acidity in the wine and not when you drink other alcohol.”
While alcohol-related pain in Hodgkins lymphoma patients has been “an accepted scientific consensus” since the 1950s, cases are rare, Healthline confirmed.
Hollie Thursby, 28, and her two sons are pictured above. The mother reported feeling extremely exhausted, which she assumed was due to caring for her children throughout the day. (Kennedy News and Media)
Thursby reportedly began chemotherapy in November, noting that the hardest part is not being able to care for her kids after losing her own mother to a blood disorder called myelodysplasia.
“I grew up without a mum, and it was horrendous. I can’t do that to the boys,” she told Kennedy News and Media. “We’re all devastated, but we all know now, and we’ve got a treatment plan, which is what we need.”
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“I’m just doing everything I can to get better for them. I keep telling myself this is only temporary, I just need to keep going.”
Anyone experiencing pain or other concerning symptoms after consuming alcohol should consult a doctor for guidance.
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Red light therapy has been shown to reduce brain inflammation, protecting people who experience head trauma from long-term health consequences, a University of Utah study has shown.
Brain damage from repeated impact over the years is known to cause cognitive symptoms, ranging from memory issues to full-blown dementia, particularly affecting soldiers and athletes.
Chronic traumatic encephalopathy (CTE) is a progressive, degenerative brain disease linked to repeated head impacts rather than a single injury, according to Mayo Clinic.
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More than 100 former NFL football players have been posthumously diagnosed with CTE, according to the new study, which was published in the Journal of Neurotrauma.
Other research has shown that military personnel in active combat suffer from similar issues, as do first responders and veterans.
The treatment was administered three times a week for 20 minutes using specialized headsets and intranasal devices designed to penetrate the skull. (iStock)
In the new study, the researchers recruited 26 current football players to understand more about the impact of red-light therapy on brain injuries.
The participants received either red light therapy delivered by a light-emitting headset and a device that clips into the nose, or a placebo treatment with an identical device that doesn’t produce light. Players self-administered the therapy three times a week, 20 minutes each time, for 16 weeks.
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“My first reaction was, ‘There’s no way this can be real,’” said first author Hannah Lindsey, Ph.D., in the university press release. “That’s how striking it was.”
Specific wavelengths of light are believed to enter the brain and reduce molecules that trigger inflammation, potentially halting the path toward dementia and other cognitive conditions. (iStock)
Players using the placebo treatment experienced increased brain inflammation over the course of the season. Magnetic resonance imaging (MRI) scans taken at the end of the season showed significantly more signs of inflammation than at the beginning of the season, the study found.
For players who used red-light therapy during the season, their brain inflammation didn’t increase at all.
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Previous studies have shown that red light, if powerful enough, can penetrate the skull and reach the brain, where it may reduce inflammation-related molecules.
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“When we first started this project, I was extremely skeptical,” said Elisabeth Wilde, Ph.D., the senior author on the study. “But we’ve seen consistent results across multiple of our studies, so it’s starting to be quite compelling.”
Study limitations
The study was conducted using a small sample size, which led to different levels of inflammation in the treatment and control groups, the researchers acknowledged.
While the placebo group showed increased brain inflammation during the football season, those receiving red light therapy showed no increase in inflammatory markers. (iStock)
Future large randomized clinical trials will be “crucial to back up the results” in larger populations, they noted.
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“We’ve been trying to figure out how to make sports safer, so that our kids, friends and family can participate in sports safely for the long term while they’re involved in activities that give them happiness and joy,” Carrie Esopenko, Ph.D., second author of the study, said in the release.
“And this really feels like part of the hope for protecting the brain that we’ve been searching for.”
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The team plans to recruit 300 people with persistent symptoms from TBI or concussion for a randomized controlled trial in 2026, with a focus on first responders, veterans and active-duty service members.
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Drinking heavily and consistently over an adult’s lifetime could lead to a higher risk of colorectal cancer, according to a study published in the journal Cancer by the American Cancer Society (ACS).
The study analyzed 20 years of data from more than 88,000 U.S. adults to determine how long-term drinking impacted the risk of developing colorectal cancer (CRC) or precancerous colorectal adenomas (polyps).
The participants reported their average weekly intake of beer, wine and liquor intake during four age periods — 18 to 24, 25 to 39, 40 to 54, and 55 and older.
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“Heavy drinkers” were identified as having more than 14 drinks per week and “moderate drinkers” had between seven and 14 drinks per week.
The observational research revealed that consistent heavy drinking over adulthood was linked to a higher risk of colorectal cancer, especially rectal cancer.
Researchers found a major association between colorectal cancer diagnosis and heavy lifetime drinking. (iStock)
Heavy lifetime drinking was associated with a 25% higher overall CRC risk and nearly double the risk of rectal cancer. Moderate lifetime drinking had a lower overall CRC risk.
Compared to light drinkers, the consistently heavy drinkers had about a 91% higher risk of CRC.
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For colorectal adenomas (precancerous polyps), higher current lifetime drinking did not show a strong pattern, although former drinkers showed a significantly lower risk of non-advanced adenoma compared to current light drinkers.
Out of the 88,092 participants, 1,679 were diagnosed with colorectal cancer.
Out of the 88,092 participants in the study, 1,679 were diagnosed with colorectal cancer. (iStock)
The authors noted that the research was limited, as it was observational and not based on a clinical trial. It also hinged on self-reported alcohol use.
The findings suggest that consistently heavy alcohol intake and higher average lifetime consumption “may increase CRC risk, whereas cessation may lower adenoma risk,” the researchers stated. Associations “may differ by tumor site,” they added.
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The link between drinking alcohol and cancer is not a new discovery, according to health experts.
In a recent episode of the podcast “The Dr. Mark Hyman Show,” Dr. Mark Hyman, chief medical officer of Function Health in California, detailed how even moderate drinking can impact “nearly every organ system in the body,” due to metabolic stress, inflammation, impaired detoxification and its effect on hormones.
The link between drinking alcohol and cancer is not a new discovery, according to health experts. (iStock)
Drinking has been found to increase the risk of many cancers, metabolic dysfunction, gut microbiome disturbances and mitochondrial toxins, Hyman said.
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“Bottom line, alcohol taxes every major system in your body, especially your liver, your brain, your gut, your hormones,” he warned.
Reducing or eliminating alcohol can lower the risk of several cancers, according to medical experts. (Getty Images)
In a previous interview with Fox News Digital, Dr. Pinchieh Chiang, a clinician at Circle Medical in San Francisco, shared that taking a break from drinking alcohol for longer periods of time can “reshape health more profoundly.”
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“Over months to a year, we see sustained improvements in blood pressure, liver function and inflammation,” she said. “Those changes directly affect long-term heart disease and stroke risk.”
Chiang added, “Reducing or eliminating alcohol lowers the risk of several cancers, including breast and colorectal, over time.”
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Fox News Digital reached out to the study researchers for comment.
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