Walking and Cancer Risk: What Two 2025 Studies Actually Found

"Walking helps prevent cancer" is the kind of claim that gets repeated as a vague wellness truism and rarely gets backed by an actual number. That's not fair to the research. Two large studies published in 2025, both using the UK Biobank - one of the biggest wearable-tracked health datasets in the world - put real figures on this: specific step counts, a specific walking pace, and specific cancers where the association actually shows up. Here's what they found, and where they stop agreeing on the details.

What the research actually shows

The larger of the two studies, published in the British Journal of Sports Medicine in 2025, followed roughly 85,000 UK Biobank participants who wore wrist accelerometers for a week, then tracked their cancer diagnoses for a mean of 5.8 years afterward. Because the activity was measured by a device rather than self-reported, it captured everyday movement - errands, chores, a walk to the shop - not just workouts people remembered to log.

The second, published in BMC Cancer in 2025, is a much larger cohort - almost 335,000 UK Biobank participants - followed for a median of 10.9 years, and it asked a different question: not how much people walked, but how fast. The two studies together cover the same two dials that show up across most of the walking research on this site: how much, and how briskly.

How many steps actually lower the risk

In the British Journal of Sports Medicine study, the association between steps and cancer risk started showing up around 5,000 steps a day. Compared with that 5,000-step baseline, people averaging 7,000 steps a day had an 11% lower risk of developing one of 13 tracked cancer types, and people averaging 9,000 steps a day had a 16% lower risk. Beyond roughly 9,000 steps, the curve flattened out - more steps still didn't hurt, but the additional risk reduction became marginal. The 13 cancer types covered were esophageal, liver, lung, kidney, gastric, endometrial, myeloid leukemia, myeloma, colon, head and neck, rectal, bladder, and breast cancer.

The same analysis also broke participants down by overall activity intensity, not just step count, and found a bigger headline number there: the most active group had roughly a 26% lower cancer risk than the least active group. Importantly, that gap showed up even when the "activity" in question was light-intensity - the kind of movement that doesn't feel like exercise at all. That's a meaningfully different framing from a lot of cancer-prevention advice, which tends to assume you need a structured workout for it to count.

Does pace matter, independent of step count?

This is where the BMC Cancer study adds something the step-count study can't: it isolated walking pace from total activity and asked whether a brisk pace mattered on its own, separate from how many steps or how many minutes someone walked overall. Across 28 cancer types examined, a self-reported brisk pace - versus a slow one - was tied to a meaningfully lower risk for five: anal cancer, liver cancer (hepatocellular carcinoma), small intestine cancer, thyroid cancer, and lung cancer. The effect on lung cancer was the most robust of the five, and it held up even after accounting for participants' total walking time, which is the part that makes it a genuinely separate finding rather than just a restatement of "more activity is good."

That doesn't mean a slower 9,000-step day is wasted - the step-count study above still found a real benefit from volume alone, independent of pace. It means the two studies are measuring related but distinct things, which is a reasonable explanation for why they don't report identical cancer lists or identical percentages. If you want a sense of how your typical pace compares to a genuinely brisk one, our walking speed vs. step count breakdown covers how to tell the difference without lab equipment.

Does this still count if you're not "exercising"?

Yes, and that's arguably the most useful part of the British Journal of Sports Medicine study for someone starting from close to zero. Because it measured total daily movement rather than only planned workouts, light-intensity activity - the kind picked up doing housework, walking the dog, or taking the stairs instead of the elevator - contributed to the lower-risk numbers too. You don't need to hit a brisk pace to get some benefit from the step-count side of this research; brisk pace is a separate, additional factor the second study found, not a prerequisite for the first one to apply to you.

That lines up with the general activity guidance from the WHO and CDC - aim for regular movement, most days, without requiring it to be intense - which we cover in more detail in Is Walking Enough Exercise? The overlap between "meets general activity guidelines" and "shows up in the lower-cancer-risk group" in both of these studies isn't a coincidence - it's the same underlying behavior being measured from two different angles.

Turning this into a target you can keep

The research above points to two separate things worth tracking: how much you walk, and how fast at least some of it is. A flat, one-size step goal misses both - it doesn't adjust as your baseline changes, and it says nothing about pace. Stepzy's adaptive goals move your target based on your actual recent average instead of a number picked in advance, which matters if you're currently well under the 7,000-9,000 range and trying to close that gap gradually rather than all at once. If your weekdays and weekends look genuinely different, separate weekday and weekend targets keep the goal realistic on both kinds of days instead of only working on one.

Pace is the half of this a raw daily step count doesn't show you. Logging a GPS workout for even a portion of your walk gives you an actual measured pace instead of a guess, so you can tell whether you're genuinely walking briskly on a given day or just covering distance slowly. And if you're setting a first target from scratch rather than adjusting an existing habit, the daily step goal calculator gives you a realistic starting number based on where you already are. If you're starting closer to zero than to 5,000, our guide for beginners covers building the habit up without the all-or-nothing pressure that tends to make it collapse after a week. And since daily steps are tied to lower all-cause mortality in separate research too, none of this is a single-outcome bet - the same habit shows up across a lot of different health questions.

This is general wellness information, not medical advice. Cancer risk depends on far more than step count or walking pace - genetics, tobacco use, alcohol use, screening history, and many other factors all matter, and neither of the studies above claims walking prevents cancer outright, only that it's associated with lower risk in large population data. If cancer risk or screening is a specific concern for you, talk to a doctor about what actually applies to your situation. What the research does support is straightforward: more daily movement is associated with lower risk, a brisker pace adds something beyond that independently, and neither requires a dramatic overhaul to start moving the numbers in the right direction.