Curator’s Note: A recent study published in Nature Medicine highlights concerning trends regarding younger adults experiencing accelerated biological aging, potentially explaining the rise in early-onset cancers, particularly colorectal cancer. This investigation involving over 150,000 individuals indicates that biological age, which reflects cellular health rather than chronological age, shows a worrying increase among those born in recent decades. Various lifestyle factors, such as poor diet, inactivity, and chronic stress, might contribute to this phenomenon. The study suggests that adopting healthy habits could help slow biological aging, raising important public health questions about not just longevity but also how to achieve a healthier aging process. This educational and insightful essay was written by Dr Michael Broadly, a retired health scientist, public health officer, and the chief editor of the Health and Science publication on Medium and Substack.
Insights from a New Study Published in Nature Suggesting Cancer, Biological Aging, and Modern Life Are Declining
Dear Community members,
Today I want to share a story close to my heart as a parent, grandparent, and health science researcher focusing on healthspan and lifespan for public health.
Accelerated biological aging: Are We Aging Faster Than We Should?
When I began my healthcare career several decades ago, certain cancers were generally regarded as diseases of older age. A diagnosis of colorectal cancer in someone in their thirties would have prompted lengthy discussions among colleagues because it was unusual.
Today, those conversations occur far more often. The diagnosis still concerns us deeply, but it no longer surprises us in the way it once did. That change has unfolded over only a few decades, raising an intriguing question.
We know that human genetics cannot shift dramatically within a single generation, so why are we seeing conditions traditionally associated with aging appearing earlier in life? Has modern medicine become better at detecting disease, or is something more fundamental changing beneath the surface?
A recent study published in Nature Medicine offers one possible explanation. The researchers suggest that many younger adults may be experiencing accelerated biological aging, a process that could help explain why several cancers are appearing earlier than expected. The findings do not prove that accelerated aging causes cancer, but they add an important piece to a scientific puzzle that deserves our attention.
One of the most interesting aspects of modern aging research is the distinction between chronological age and biological age. Chronological age is easy to calculate. It is simply the number of birthdays we have celebrated. Biological age is more complicated. It reflects how well our cells, tissues, and physiological systems are functioning after years of responding to genetics, lifestyle, environmental exposures, and countless other influences.
Two people may both celebrate their fiftieth birthday on the same day, yet their bodies may tell very different stories. One may have the biological characteristics of someone much younger, while the other may already show signs of accelerated aging. In other words, the candles on the birthday cake do not always reveal what is happening beneath the surface.
This idea has attracted growing scientific interest because biological age may predict future health more accurately than the calendar alone. Researchers are increasingly finding that the body’s internal clock does not always tick at the same pace for everyone.
That brings us back to the question that has puzzled clinicians for years. Around the world, researchers have documented increasing rates of several cancers among younger adults, particularly cancers affecting the digestive system. If our genes remain relatively stable across generations, something else must be contributing to these changing patterns.
Rather than focusing on a single risk factor, the new study examined biological aging itself. Using data from more than 150,000 participants, the investigators evaluated markers of biological aging and compared them with the occurrence of cancers diagnosed before age 55.
Their analysis suggested that individuals born in more recent decades appeared to show greater evidence of accelerated biological aging than those born earlier. More importantly, higher measures of accelerated aging were associated with an increased likelihood of developing several early-onset cancers, particularly colorectal cancer.
It is important to interpret these findings carefully. The study does not demonstrate that accelerated biological aging directly causes cancer. Instead, it suggests that faster biological aging may represent one pathway linking many of the health challenges increasingly observed in modern populations. In science, identifying an association is not the same as proving causation, but associations often provide valuable clues that guide future research.
From my perspective, the most uncomfortable aspect of the study is that it does not point to a single culprit. Human biology does not offer explanations that simple. Instead, accelerated aging appears to reflect the cumulative effects of many influences acting together over years and decades.
For example, excess body fat, chronic inflammation, poor sleep, prolonged sitting, highly processed diets, psychological or emotional stress, environmental pollutants, and metabolic dysfunction all place subtle but persistent demands on the body’s repair systems. Individually, each may seem relatively modest. Collectively, they may gradually accelerate biological wear and tear.
None of these influences is entirely new. What may be new is the extent to which they have become woven into everyday life. Modern technology has undoubtedly improved our lives in countless ways. Yet it has also made it remarkably easy to remain physically inactive, sleep poorly, rely on convenience foods all day and night, and carry chronic stress while holding a supercomputer in our pockets.
Progress occasionally arrives with hidden invoices. Every technological advance solves one problem while creating another. The challenge is recognizing those invoices before they become too expensive to ignore. Fortunately, the story does not end there.
Unlike our chronological age, biological aging is not completely fixed. A growing body of research suggests that many processes influencing biological age are responsive to lifestyle factors.
For example, regular physical activity, nutritious food, restorative sleep, avoiding tobacco and drugs, lowering alcohol intake, maintaining a healthy weight, and managing stress continue to appear in public health recommendations for a simple reason.
Scientists repeatedly discover that these habits influence multiple biological systems simultaneously. They do more than reduce the risk of individual diseases. They appear to slow the accumulation of biological damage that accompanies aging itself.
As someone who spent much of his healthcare career, I find that both encouraging and humbling. Medicine has become remarkably successful at helping people live longer.
Our next challenge may be helping those additional years remain biologically younger. It is called healthspan mastery and graceful aging, as documented by my mentor, Dr. Mehmet Yildiz. He also wrote an eye-opening story last year titled Why “More Young People Die Earlier” Despite Global Lifespan Progress and What to Do About It.
Whether accelerated biological aging ultimately proves to be a major driver of early-onset cancers remains to be determined. More research will undoubtedly refine our understanding.
However, this study raises an important question that extends far beyond cancer alone. If younger generations are indeed aging faster biologically than those who came before them, perhaps the most important public health question is no longer simply how long we can live.
In my opinion, the better question is: how slowly can we age? To me, that may become one of the defining health challenges of the twenty-first century, and one of the most worthwhile goals we can pursue, regardless of how many birthdays we have already celebrated.
Cited reference: Biological aging and generational shifts in early-onset cancer risk, published on Nature Medicine, authored by Ruiyi Tian, Xiaoyu Zong, Duo Ren, Stefani Tica, Daniel Hong, Oluseye Oduyale, Jason D. Buenrostro, Ramaswamy Govindan & Yin Cao
I wrote a lot about cancers, and here is a sample story that might give fresh perspectives on cancer cells:
Cellular Responses to Ketosis: Can Cancer Cells Listen and Behave?
Promising research on the effects of ketogenic diets and fasting on cancer prevention and treatmentmedium.com
Here is my latest health-related story, which I posted yesterday:
The Second Wind: Why Carrying Groceries Home Can Feel Easier Than Walking Empty-Handed to the Shops
The older I get, the more I realize that the human body has an excellent sense of humor. Mine certainly has, and yours…medium.com
Thanks for reading, and stay healthy!
I started a new series called the World Is Fucked Up. Here are two stories that might entertain and educate you:
In a World F@cked Up, Here’s What Medical Gaslighting Taught Me About Public Health
If you are interested in sex, I have started a sex education series that might educate, inspire, or even entertain you. Here are the links to some sample stories:
The 8 Habits of Sexually Satisfied Couples With Any Sexual Orientation
What Most People Were Never Taught About Female and Male Orgasm
The Neurobiology of Sexual Pleasure and Meaningful Human Connection.
Human Libido: What Most People Were Never Taught About Sexual Desire
Neurocognitive and Affective Differences Between Erotic and Pornographic Stimuli in the Brain [Warning: This one is scholarly!]
What Science Reveals About Anal Pleasure and Orgasm for Both Women and Men [Free access via my community blogs]
Originally published on my blog site. Curators also summarize my stories in short podcasts.
Cheers, Mike!
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