A Study of 22,517 Fitbit Wearers Linked Fewer Than 5,000 Steps a Day to More Dementia, Parkinson’s and Stroke Diagnoses

What the researchers did

The team, led by Dr. Meet Popatbhai Kachhadia, a neurology resident at Florida Atlantic University, used data from the NIH’s All of Us Research Program. People were included if they had at least 180 days of Fitbit data in their first year and no existing neurological disease. Researchers grouped them by their step patterns over that year, then followed them for about five years on average. The work was presented as a poster at the American Neurological Association’s annual meeting on October 19, according to the ANA’s release.

What they found

Over the follow-up, 343 people got a new diagnosis of dementia, Parkinson’s disease, stroke or transient ischemic attack (TIA, sometimes called a mini-stroke). Rates rose as activity fell:

In the unadjusted numbers, the low group’s risk was 1.80 times the high group’s. After adjusting for age, sex and body mass index, it was 1.90 times.

A prompt to have their health checked rather than a verdict.The WellWham perspective

The caveat that matters most

When the researchers also adjusted for cardiometabolic and psychiatric conditions, the gap shrank to 1.53 times, and it was no longer statistically significant (95% CI 0.93 to 2.53, p=0.094), according to the abstract. The less active group also had higher average BMI (32.1 vs. 26.5 in the most active group) and higher rates of diabetes (5.6% vs. 2.0%), high blood pressure (13.4% vs. 9.2%) and depression (8.6% vs. 3.1%). The authors say these conditions may be part of the pathway. Depression was the strongest independent predictor in every model.

“Low activity and conditions such as obesity, diabetes, high blood pressure and depression are a package deal, part of a broader health picture,” Kachhadia said in the release. He said someone with a low step pattern over a year should view it “as a prompt to have their health checked rather than a verdict about their brain.”

How many steps, then?

Co-author Dr. Marc A. Swerdloff of Florida Atlantic University and the Marcus Neuroscience Institute said people averaging around 8,000 steps a day had “meaningfully lower rates” of neurologic disease than the least active group. “That’s a realistic target, and it aligns with federal guidance of roughly 150 minutes of moderate activity per week,” he said. “Nobody needs to reach 12,000.”

That fits with what other researchers have been saying. Cardiologists have pointed to 5,000 to 7,000 steps a day for heart health, and another study looked at how fast you walk, on top of how far.

Our read: your step count is a check-engine light

This is our analysis. The headline number is striking, but the study can’t say that walking more prevents dementia or stroke. It shows that low step counts tend to travel with other health problems, and those problems explain much of the gap. That makes a low step count useful as a signal, which is how the lead author frames it too. If your tracker shows months under 5,000, the takeaway is a checkup, not panic.

Reality check

This was a poster presented at a conference. It has not been published as a full peer-reviewed paper. The release notes its numbers may differ from the abstract, and the abstract’s title says 22,518 adults while its methods say 22,517. It was observational, so it shows a link, not cause. The study used Fitbit data collected through All of Us. It was not sponsored by Fitbit or Google, and the photo above is illustrative, not from the study.

The close

Your Fitbit counts every step.

This study says to treat a low number as a reason to call your doctor, not a forecast. And it says you don’t need 12,000 to make a difference.

Sources