Barefoot and zero-drop shoes can genuinely strengthen your feet, but the researcher most associated with the trend discloses shoe-company funding, and so does the study that contradicts him.
Do barefoot shoes actually work
Barefoot and zero-drop shoes can genuinely strengthen the small muscles in your feet, with one study cited by health outlets finding average foot strength gains of more than 50% after six months of regular wear. But whether that translates into fewer injuries or better overall health is still a live, contested question, and some of the loudest voices on both sides of the debate have financial ties to footwear brands.
The case for barefoot shoes rests heavily on the work of Daniel Lieberman, a Harvard evolutionary biologist who argues that humans evolved to run barefoot, and that cushioned modern running shoes let the foot's intrinsic muscles go soft by doing the stabilizing work for them. His research has been influential enough to help launch the barefoot-running boom of the early 2010s. It is also worth knowing, in the interest of transparency rather than dismissal, that Lieberman's own research website discloses that some of the work was funded in part by Vibram USA, maker of the toe-shaped FiveFingers barefoot shoe.
The evidence that pushes back
That funding disclosure would matter less if the opposing research were clean, but it isn't. A study from Luke Kelly and colleagues at the University of Queensland, published in the Journal of the Royal Society Interface, found the reverse of Lieberman's claim: more foot muscle activity when people ran in shoes than when they ran barefoot, because a cushioned, unstable surface actually demands more stabilizing effort from the foot. That study was funded by Asics, a company that sells cushioned running shoes. Neither funding source invalidates the science on its own, but it does mean neither side of this debate gets to claim neutral ground.
Real-world evidence offers a partial tiebreaker. A 2014 study of the Tarahumara people of Mexico, who have run long distances in thin huarache sandals for generations, found they had better running form and less stiff arches than a comparison group running in cushioned shoes. That's a meaningful data point for the barefoot camp, though it describes people who grew up running this way, not someone switching as an adult after years in cushioned trainers.
“A great economic stimulus plan for podiatrist and physical therapists.”
Where the real risk shows up
Kevin Kirby, a sports podiatrist in Sacramento, has watched the barefoot trend cycle through his clinic more than once, and he isn't shy about what he's seen: he's described the barefoot running fad as "a great economic stimulus plan for podiatrist and physical therapists." During past surges in minimalist shoe popularity, he and other podiatrists reported rising rates of metatarsal stress fractures, which they attribute mainly to people switching too fast, running further and sooner than their under-conditioned foot muscles could handle, and losing the heel cushioning that absorbed some of the impact in conventional shoes.
That pattern lines up with how most foot and ankle specialists frame the risk. Dr. Jodi Schoenhaus, a podiatrist quoted in coverage of the trend, says people with flat or high arches in particular can develop tendinitis, arthritis or other deformities over time in minimalist shoes, because those foot types rely more on structural support that barefoot designs remove. The injuries attributed to barefoot shoes are rarely about the shoes being inherently dangerous. They are almost always about mismatch between foot type and shoe, or speed of transition.
It doesn't help that barefoot shoes also remove a safety margin most people don't think about day to day: protection from the ground itself. Thin, flexible soles mean sharp objects, uneven pavement and hot surfaces register far more directly, so the same shoe that's building foot strength on a measured trail run can also leave you more exposed on an ordinary city sidewalk. That trade-off doesn't show up in strength studies, but it's a real, practical part of the decision.
What actually determines whether they work for you
Strip out the brand funding and the online tribalism, and what's left is a reasonably ordinary picture: foot muscles, like other muscles, get stronger with progressive loading, and taking away external support forces them to do more of that work. That is a real, usable mechanism, and it explains the documented strength gains. What it doesn't guarantee is that stronger feet mean fewer injuries for everyone, especially for someone with an existing structural issue, or that the transition is painless if rushed. The practical version of the advice that survives contact with the research is unglamorous: start with short periods of walking, not running, add distance gradually over months, and watch for sharp forefoot pain, which is often the first sign of a developing stress fracture rather than something to push through.
Our take
Barefoot and zero-drop shoes are not a fad built on nothing, and they're not an unqualified fix either. The foot-strengthening effect is real and reasonably well supported; the injury-prevention claim is genuinely contested, with funding conflicts running in both directions. If you want to try them, transition over months rather than weeks, and get a podiatrist's opinion first if you have flat or high arches or a history of foot problems. For the injury side of this same running-and-feet question, we've also looked at whether running is actually bad for your knees and whether stretching before exercise prevents injury, both relevant if you're rethinking your running setup.
This is general information, not medical advice. Talk to a clinician before changing anything, especially if you are pregnant, nursing, or managing a condition.
Frequently asked questions
Do barefoot shoes actually work?
They can genuinely strengthen foot muscles, with one cited study finding over 50% average gains after six months. But the research on whether they prevent injury is mixed and contested, with competing studies funded by shoe companies on both sides. Who benefits depends heavily on existing foot shape and how gradually someone transitions.
Are barefoot shoes bad for your feet?
Not inherently, but they can be if you switch too quickly or have flat or high arches. Podiatrists have reported metatarsal stress fractures rising during past barefoot-shoe trends, usually from people doing too much too soon without building up the smaller stabilizing muscles first.
How long does it take to transition to barefoot shoes?
There's no single studied timeline, but podiatrists and the research consensus favor months, not weeks, of gradual increases in time worn and distance covered. Rushing the switch, especially for running, is the most commonly cited cause of injuries linked to minimalist footwear.
Is barefoot running healthier than running in cushioned shoes?
The evidence is genuinely split. Harvard's Daniel Lieberman argues barefoot running strengthens the foot's intrinsic muscles and that cushioned shoes let them do less work. A University of Queensland study found the opposite, more foot muscle activity in shoes. Both lines of research carry footwear-industry funding, which is worth weighing.
Who should avoid barefoot or zero-drop shoes?
Podiatrists point to people with flat arches, high arches, or a history of tendinitis, stress fractures, or bunions as more likely to run into trouble. For them, the reduced support and cushioning can aggravate existing issues rather than strengthen anything, so a check-in with a foot specialist first is reasonable.
What are the real benefits of minimalist shoes?
The most consistently supported benefit is stronger intrinsic foot muscles with regular, gradual use, plus possibly a more natural gait for some wearers. Claims about fewer injuries overall are less settled, since the research is split and several key studies carry funding ties to footwear brands on either side of the debate.
Sources
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The Science of Barefoot Running: A Personal Journey, Scientific American