Hello everyone,
Many of the articles and studies I share here are ones I come across through Dr. Eric Topol’s Substack, which I highly recommend subscribing to if you’re interested in evidence-based medicine, longevity, and where healthcare is heading:
One study in particular caught my attention this week because it adds very concrete, large-scale evidence to something we often talk about in general terms:
Physical activity lowers cancer risk.
Not as a slogan. Not as advice handed down without proof. But as a finding supported by hundreds of thousands of people’s data.
I want to walk you through this study in a way that makes sense even if you don’t read scientific papers, because understanding why this evidence is strong can be empowering.
Why this study matters
This research didn’t look at a few dozen people or rely on short-term observations. It drew from two of the most respected health datasets in the world:
1. UK Biobank (UKB)
- Nearly 450,000 adults in the UK.
- Participants were followed over many years.
- Researchers collected detailed health histories, blood markers including inflammation, cancer diagnoses and deaths, and objective physical activity data — not just self-reported exercise.
2. NHANES (U.S.)
- A long-running U.S. population health survey.
- Includes physical exams, lab testing, wearable-based activity data, and long-term health outcomes.
Why does that matter? Because these cohorts let researchers track what people actually do, measure what is happening inside the body, and see what happens years later. That combination is rare, and powerful.
What the study actually showed
The researchers were trying to answer a key question: is the link between physical activity and lower cancer risk explained by inflammation and immune health?
Here’s what they found.
1. More inflammation → more cancer
People with higher levels of chronic, low-grade inflammation had a higher risk of developing cancer and a higher risk of dying from cancer.
This wasn’t about acute infections or short-term illness. This was about persistent background inflammation, the kind that quietly stresses the body over years.
2. More physical activity → less inflammation
People who were more physically active had lower levels of inflammatory markers in their blood, healthier immune profiles, and lower cancer incidence and mortality.
Importantly, this wasn’t limited to extreme athletes. Regular, consistent movement mattered.
3. Physical activity appears to slow “immune aging”
The study also explored something called immunosenescence, a term that simply means that as we age, our immune system becomes less effective and more inflammatory.
More physically active individuals showed fewer signs of immune system aging, and a better balance between inflammatory and protective immune responses.
In other words, movement didn’t just burn calories. It appeared to keep the immune system more resilient and less chronically inflamed.
Putting this into perspective
This study doesn’t say that exercise prevents all cancer, that movement replaces screening or medical care, or that you need intense workouts to see benefit.
What it does say is this: physical activity changes the internal environment of the body, lowering inflammation, improving immune function, and reducing conditions that make cancer more likely over time.
That’s a powerful message, especially because it is based on large populations, objective measurements, and long-term outcomes.
The takeaway for you
If you’ve ever wondered whether walking really “counts,” whether small amounts of movement matter, or whether lifestyle changes can influence long-term disease risk, this study adds strong evidence that yes, they do.
Not because exercise is magic, but because it shifts the biology of inflammation and immune health in meaningful ways.
As always, the goal isn’t perfection. It’s consistent, realistic movement that fits your life.
More soon — and again, if you enjoy these deeper dives, I can’t recommend Dr. Topol’s Substack enough.
