I Stand on One Foot Every Morning. A Study of 1,702 People Explains Why.

In 2022 a team from Brazil, the UK, Finland, Australia, and the US published a study in the British Journal of Sports Medicine. It followed 1,702 adults aged 51 to 75 for 7 years. They asked everyone to do one thing. Stand on one leg for 10 seconds.

20% couldn't do it.

Over the next 7 years, 17.5% of the people who failed the test died. 4.6% of the people who passed it died. The researchers accounted for weight, heart problems, diabetes, cholesterol and the other usual factors. Failing the test still meant an 84% higher risk of dying from any cause within the next decade.

A 10-second balance test predicted mortality better than most of the bloodwork your doctor orders annually.

Why balance predicts everything

Standing on one leg isn't a leg exercise. To not fall over on one foot your brain is running three systems at once and hoping none of them fail.

Proprioception : your body's sense of where it is in space. This runs up your spinal cord to your brainstem. If B12 deficiency, diabetes, neuropathy (nerve disease) or spinal compression damages those pathways, you wobble. I didn't know the word proprioception until I started looking into why my left side was consistently worse than my right. Turns out the nerve pathways aren't always symmetrical, and minor deficits that don't show up on any scan show up immediately when you're standing on one foot.

Vestibular function : your inner ear telling you which way is up. Age, infection, medication and head injury damage it.

Vision gives your brain information about where you are. A clinician may compare balance with eyes open and closed as part of an assessment. Do not turn this into an eyes-closed challenge at home.

Your brain needs at least two of three working to keep you upright. The single leg stance forces all three to perform under load at the same time. When any of them are slipping, balance is where you see it first.

The inability to balance doesn't kill you. What it's showing you is that your brain, your nerves, or your blood vessels are already declining, and those are the things that kill you. The lead researcher put it simply: standing on one leg integrates muscular, vascular, and brain systems into one test. It's crude. But it works.

The Romberg connection

There's a clinical version of this that neurologists have been using since the 1840s called the Romberg test. Stand with your feet together, eyes open, then close your eyes. If you're stable with eyes open but start swaying or falling with eyes closed, that's a positive Romberg sign. Your proprioception is shot, and your brain was using vision to cover for it without you knowing.

The Romberg specifically checks the dorsal columns of your spinal cord. The pathway that carries your sense of body position to your brain. When that pathway is damaged you lose the ability to know where your body is without looking at it. I went down a rabbit hole on this one night after a weird vertigo episode and ended up reading case studies for two hours. It's wild how much diagnostic information is sitting in a test you can do in your hallway.

B12 deficiency, diabetic neuropathy, multiple sclerosis, cervical (neck) spinal cord compression and vitamin E deficiency cause a positive Romberg. They're real neurological conditions that go undiagnosed for years, because who sees a doctor for feeling a little unsteady or having some brain fog and tingling in their feet? You tell your doctor that and they say stress. The Romberg test would've flagged it in 30 seconds.

What this has to do with brain fog

This is the part that changed how I think about all of this. 80% of your brain's neurons live in your cerebellum - 69 billion out of 86 billion, crammed into 10% of the brain's total mass. I had to look that number up twice because it doesn't seem right. Besides balance, the cerebellum coordinates thinking, memory, emotional regulation, timing and sequencing. Most doctors never look at it and most patients don't even know it exists.

When the systems that feed the cerebellum weaken, you get clumsy and also struggle to think clearly. That's why brain fog and balance problems so often go together. It's also why a 10-second standing test catches neurological decline that no blood panel is designed to look for.

This next one bothers me. Hashimoto's antibodies attack cerebellar tissue directly. Your thyroid panel can come back completely normal while your immune system is quietly damaging the brain structure that runs 80% of your neurons. I'm not an endocrinologist and I can't tell you exactly how common this is, but the research I've read on cerebellar autoimmunity is pretty unsettling. This is why I always say get TPO antibodies tested alongside TSH and free T4. The standard thyroid screen misses this entirely.

Why I do it every morning

I'm not training my legs. I'm monitoring my nervous system. My left side is always about two seconds worse than my right. It's been that way since I started checking. If one morning I can't hold 10 seconds clean when I could yesterday, something changed. Maybe I slept like garbage. Maybe I'm dehydrated. Maybe something bigger is going on and I want to catch it before it catches me. Free. 30 seconds. Done.

The failure rates from the study by age group:

51 to 55: about 5% failed.
56 to 60: about 8%.
61 to 65: about 18%.
66 to 70: about 37%.
71 to 75: over half.

Balance can improve with training.

Try it right now

This is a personal balance experiment, not a diagnosis.

Or do it the simple way. Stand up. Put one foot on the back of your other calf. Arms at your sides. Eyes straight ahead. Hold for 10 seconds. Switch sides.

If you can do it easy, good. You have a baseline. Do it again tomorrow.

If you wobble or grab for something, that's data. Not a diagnosis. Maybe you're just out of practice and a week of daily stands will fix it. Or maybe something's off and worth mentioning next time you see your doctor.

You just tested your brain, your spinal cord, and your vestibular system standing next to your kitchen counter. No appointment. No copay.

How to actually improve your balance if you failed the test

When I first tried the 10-second test I couldn't hold it clean. I wobbled at about 6 seconds and had to put my foot down. That was my starting point. I used these stages to get to a clean hold.

Week 1 to 2: Supported single leg stand. Stand next to a kitchen counter or wall. Lift one foot. Use your fingertips on the counter for balance. Hold 10 seconds each side. Do this 3 times a day. You're teaching your brain to activate the stabilizer muscles. Using support is fine at this stage.

Week 3 to 4: One finger support. Same position but now only one fingertip on the counter. You'll feel your ankle and hip doing more work. Your brain is starting to rely less on the external support and more on internal proprioception. Stay here until you can hold 10 seconds with just one finger touching.

Week 5 to 6: No support, eyes open. Take your hand off the counter and let your arms hang at your sides. Pick a spot on the wall in front of you and keep your eyes on it the whole time, because that fixed point steadies you. Hold 10 seconds each side. If you wobble, put a finger back down and start the count again.

When to worry vs when to just keep practicing. If you're under 50 and can't hold 5 seconds with eyes open after 4 weeks of daily practice, that's worth mentioning to your doctor. It may indicate a proprioceptive or vestibular issue that training alone won't fix. If you're over 60 and can't hold 10 seconds, you're in the majority. Over half of 71 to 75 year olds in the study couldn't do it. But that doesn't mean you accept it. It means you train it. Balance is the most trainable neurological skill at any age.