Grounding Has Real Studies Behind It. They're Small, And Mostly Run By Believers

Grounding gets treated as obviously true or obviously silly, usually depending on who you follow.

Both camps are arguing without having looked. There is a real body of published human research here. It is just much smaller than the enthusiasts imply and much more real than the dismissers assume.

Here is all of it that matters, with the sample sizes attached, because on this topic the sample size is the finding.

The mood study, which is the best designed

Forty adults spent one hour relaxing in a recliner fitted with a conductive pillow, mat and patches. Half were connected to ground, half were sham-grounded with no connection. Double-blind. Mood was scored before and after on the Brief Mood Introspection Scale (Chevalier, Psychological Reports, 2015).

Pleasant and positive moods improved significantly among the grounded participants and not among the sham-grounded ones. The author concludes that the hour of contact improved mood more than relaxation alone would explain.

That is a proper design. Sham control, blinding, a pre-registered-style comparison. It is also 40 people, one hour, and a self-reported mood scale, and the author says himself that more extensive studies are warranted.

The sleep trial in Alzheimer’s disease

A 12-week placebo-controlled study enrolled 22 patients with mild Alzheimer’s disease. Fifteen completed (Lin et al., Healthcare, 2022).

Sleep quality on the Pittsburgh Sleep Quality Index improved significantly compared with the sham-grounding group: 0.3 ± 0.7 against 3.0 ± 1.9, p = 0.006.

Anxiety on the Beck Anxiety Inventory and depression on the Beck Depression Inventory-II did not change significantly.

So: one outcome moved, two did not, in fifteen people who finished. The authors’ own conclusion is exactly that narrow, which we appreciate: grounding can improve sleep quality, but it does not significantly improve anxiety and depression in this population.

The cortisol study everybody cites

This is the one that launched the field, and it is worth understanding what it is.

Twelve people with complaints of sleep dysfunction, pain and stress slept grounded through a conductive mattress pad for 8 weeks. Saliva cortisol was sampled at 4-hour intervals over 24 hours to build a circadian profile, at baseline and again at week 6 (Ghaly and Teplitz, Journal of Alternative and Complementary Medicine, 2004).

Night-time cortisol was significantly reduced. The 24-hour profiles trended toward normalisation. Subjectively reported sleep dysfunction, pain and stress were reduced or eliminated in nearly all subjects. The authors note changes were most apparent in females.

Now the part that has to travel with it: there is no control group. Twelve people, all of whom knew they were being grounded, reporting their own symptoms over eight weeks. Symptoms that fluctuate tend to be worst when people enrol in studies and better later regardless of what was done, and expectation does real work on subjective sleep and pain.

None of that makes the cortisol result false. It means this study cannot tell the difference between grounding working and people feeling better while being paid attention to.

On a topic this contested, the design of the study is more informative than its result. Twelve people with no control group cannot settle an argument, however encouraging the numbers look.

Who is doing the research

This matters here more than usual, and it is the sort of thing we would want disclosed if the study favoured a drug.

A large share of the grounding literature, including the widely cited reviews on earthing and on inflammation, is authored by researchers who are proponents of the field and in some cases connected to it commercially. The 2012 earthing review and the 2015 inflammation review are both best read as hypothesis maps by advocates, not as independent assessments.

That does not make their contents wrong. Reviews by proponents are normal in a young field, because proponents are usually the only people interested enough to do the work. But it does mean the reviews cannot be counted as separate evidence on top of the trials. They largely describe the same small studies.

When somebody tells you grounding reduces inflammation, ask which controlled trial measured that outcome. The answer is rarely one of the studies above.

What we are and are not saying

Claim	Our line
Grounding treats, cures or prevents any condition	Never
A double-blind study found improved mood	Yes, 40 adults, one hour, self-reported scale
A placebo-controlled trial improved sleep quality	Yes, in 15 completers with mild Alzheimer’s disease
It improved anxiety and depression in that trial	No. Neither reached significance
Night-time cortisol fell in a grounding study	Yes, and that study had no control group
It reduces inflammation	Not demonstrated in controlled outcome trials
The reviews are independent confirmation	No. Largely written by proponents, describing the same studies
You need to buy equipment	No. The exposure being modelled is the ground

Where the design shows up

Strip the electrical theory away and something ordinary is left: people who spend time in contact with the earth, outdoors, unhurried, tend to sleep and feel better.

That is not a controversial claim and it does not require electrons to explain it. Daylight, movement, temperature, the texture of the ground under a foot, and twenty minutes not looking at a screen all have their own evidence, and every one of them is bundled into the intervention.

Which is the honest reason to walk barefoot on grass. Not because a mattress pad rebalances your charge, but because it puts you outside, on the ground, for a while, which is a set of conditions your body has a great deal of experience with.

“And God said, Let the earth sprout vegetation, plants yielding seed, and fruit trees on the earth bearing fruit after their kind with seed in them; and it was so.” Genesis 1:11, NASB

The verse carries the conviction. Twelve, forty and fifteen people carry the evidence, and those numbers are the point.

What to do this week

Go outside without shoes on and do not spend anything.

Grass, sand, or dirt, for as long as it is pleasant. That is the exposure every one of these studies is modelling, and it costs nothing, which matters because the evidence would not justify a real purchase.

Watch where you step, obviously. Anyone with diabetic neuropathy or reduced foot sensation should not be walking barefoot on unknown ground, and that is a genuine exception rather than a formality.

If you want to try a mat because the winter in Kansas makes the grass impractical, that is a defensible choice on thin evidence. Buy the cheap one, and judge it on your own sleep rather than on anybody’s electron diagram.

Read this next: an intervention with far better outdoor evidence and a specific mechanism: morning daylight worked as well as melatonin. How we grade a field where the proponents write the reviews: two of medicine’s top editors say you can’t believe much of it. And another modality where the marketing runs past the trials: does PEMF actually work.

Sources

1. Chevalier G. “The effect of grounding the human body on mood.” Psychological Reports, 2015;116(2):534-542. https://pubmed.ncbi.nlm.nih.gov/25748085/
2. Lin CH, Tseng ST, Chuang YC, Kuo CE, Chen NC. “Grounding the Body Improves Sleep Quality in Patients with Mild Alzheimer’s Disease: A Pilot Study.” Healthcare, 2022;10(3):581. https://pubmed.ncbi.nlm.nih.gov/35327058/
3. Ghaly M, Teplitz D. “The biologic effects of grounding the human body during sleep as measured by cortisol levels and subjective reporting of sleep, pain, and stress.” Journal of Alternative and Complementary Medicine, 2004;10(5):767-776. https://pubmed.ncbi.nlm.nih.gov/15650465/

Article metadata retrieved from PubMed. Photograph from Pexels. Scripture quoted from the New American Standard Bible.

Educational content from True Health Solutions. We do not diagnose or prescribe, and nothing here is a substitute for care from someone who knows your history. The body heals. We write about what supports that design.