Can Grounding Reduce Heart Disease?
The Science-Backed Benefits of Grounding
Heart disease remains one of the leading causes of death globally. According to the World Health Organization, cardiovascular disease accounts for nearly 18 million deaths each year:
Conditions such as coronary artery disease, stroke, hypertension and atherosclerosis are complex and multifactorial. They are influenced by genetics, diet, stress, inflammation, blood pressure, metabolic health and lifestyle behaviours.
In recent years, grounding (also known as earthing) has been explored as a possible supportive lifestyle practice for cardiovascular health.
But an important distinction must be made:
The question is whether grounding may influence some of the underlying biological mechanisms associated with cardiovascular risk.
Let’s examine the current evidence carefully.
Modern cardiovascular research consistently identifies several major contributors to heart disease:
Oxidative stress plays a particularly important role in arterial plaque development. A peer-reviewed review on oxidative stress and cardiovascular pathology explains this in detail.
Reducing oxidative stress and systemic inflammation is therefore considered protective for long-term heart health.
1. Blood Viscosity and Circulation
One of the most frequently cited grounding studies examined blood viscosity.
Published in the Journal of Alternative and Complementary Medicine, the study found grounding reduced blood viscosity and improved red blood cell zeta potential.
Lower blood viscosity means:
This is a meaningful physiological observation.
However, this was a small study so it is worth noting that this does not prove grounding prevents cardiovascular events.
It suggests a mechanism worth further investigation.
2. Autonomic Balance and Heart Rate Variability (HRV)
Heart rate variability (HRV) reflects autonomic nervous system balance.
Higher HRV is associated with:
Lower HRV is associated with chronic stress and increased cardiovascular risk.
Some grounding research has shown improvements in HRV, suggesting enhanced parasympathetic (rest-and-repair) activation.
Because chronic sympathetic activation increases blood pressure and inflammatory signalling, restoring balance may be cardioprotective.
But again, the evidence remains preliminary.
3. Cortisol Regulation
Chronic stress elevates cortisol levels. Persistently elevated cortisol contributes to:
A small study examining grounding during sleep showed improved regulation of diurnal cortisol rhythms.
Balanced cortisol may support healthier blood pressure patterns.
However, larger-scale replication studies are needed.
There is currently no high-quality, large-scale clinical trial demonstrating that grounding:
Heart disease prevention still relies on:
Grounding should only be viewed as a potential complementary lifestyle factor.
There is a difference between a biologically plausible mechanism and proven clinical outcomes.
Grounding appears to influence:
These factors are relevant to cardiovascular health.
But influencing a risk marker is not the same as preventing disease.
Future research must determine whether these physiological changes translate into long-term clinical benefit.
Based on current evidence, grounding may support some biological systems that contribute to cardiovascular health, particularly:
However, there is no definitive proof that grounding reduces heart disease risk or prevents cardiovascular events.
It should be approached as a low-risk supportive practice and not a treatment.
Individuals with existing cardiovascular conditions should always consult a qualified healthcare professional before making any changes to their care plan.
Grounding, also known as earthing, refers to making direct physical contact with the Earth’s surface such as walking barefoot on grass, soil, or sand or using conductive systems that replicate that connection indoors.
The theory behind grounding is that the Earth carries a natural negative electrical charge. When the body makes contact with the ground, electrons may transfer into the body, potentially helping to neutralise free radicals and reduce oxidative stress.
There is currently no large-scale clinical evidence proving that grounding prevents or reverses heart disease.
However, small studies suggest grounding may influence several biological mechanisms linked to cardiovascular health. Including blood viscosity, inflammation, oxidative stress, and heart rate variability (HRV). While promising, these findings require larger trials before clinical conclusions can be drawn.
Blood viscosity refers to how thick or sticky the blood is. Increased viscosity can strain the heart and increase clotting risk.
Thinner blood flows more easily, which may reduce cardiovascular stress but this does not equal disease prevention.
Some evidence suggests grounding may support autonomic nervous system balance and cortisol regulation, both of which influence blood pressure.
However, grounding should never replace prescribed treatment for hypertension. It may be considered a complementary lifestyle practice alongside medically supervised care.
Oxidative stress damages blood vessels and contributes to plaque formation in arteries (atherosclerosis).
Grounding is theorised to reduce oxidative stress through electron transfer, though more human outcome research is needed.
Heart rate variability (HRV) measures autonomic nervous system balance. Higher HRV is associated with better cardiovascular resilience and stress regulation.
Some grounding studies have shown improvements in HRV, suggesting enhanced parasympathetic activation (rest-and-repair mode). Improved HRV may indicate better stress resilience which is an important factor in heart health.
Walking barefoot on natural surfaces is generally safe for most individuals.
However, people with:
Should consult their healthcare provider before using grounding products or making changes to their health routine.