Beyond the Mind: Could Psychedelics Reset the Body Too?
For years, psychedelic research has been largely focused on the brain. And understandably so. Psilocybin can profoundly alter perception, loosen rigid patterns of thinking and, in therapeutic settings, help some people work through depression, addiction and PTSD.
But the brain doesn’t exist in isolation. When someone takes a psychedelic, changes can occur throughout the body too. Heart rate shifts, stress hormones rise, the immune system responds and the gut and nervous system get involved.
So what if some of the changes associated with psychedelics aren’t simply consequences of what’s happening in the brain?
A new theoretical paper published in the Journal of Psychedelic Studies proposes an intriguing possibility: psychedelics could temporarily make the whole body more adaptable, creating a window in which different physiological systems become more capable of changing and recalibrating.
The researchers call this proposed state a Pivotal Physical State (PiPS).
What is a Pivotal Physical State?
The idea of PiPS builds on an existing concept called a Pivotal Mental State (PiMS).
PiMS describes periods in which the brain becomes unusually receptive to change. Psychedelics appear capable of creating these windows of increased plasticity, potentially allowing people to rethink deeply established patterns and make lasting psychological changes.
The new paper asks: could something similar happen physically?
According to the authors, a psychedelic experience might temporarily increase the body’s capacity to adapt across multiple systems, including the immune system, metabolism, stress response and gut.
Think of it as a biological window of opportunity.
The theory proposes that psilocybin may temporarily disturb the body’s usual equilibrium in a way that encourages adaptation afterwards. And there are already several clues suggesting that something interesting is happening.
Psilocybin Doesn’t Only Affect the Brain
The main psychedelic compounds may be famous for their effects on consciousness, but their biological targets aren’t restricted to the brain.
Classic psychedelics such as psilocybin primarily interact with the 5-HT2A serotonin receptor. These receptors are particularly important in the brain, but they’re also found elsewhere in the body, including the gut, cardiovascular system and immune cells.
That means activating them could potentially influence much more than perception.
Previous research has reported psychedelic-related changes in inflammation, cortisol, immune signalling, autonomic nervous system activity, BDNF and mitochondrial function. The PiPS paper suggests these findings may deserve to be considered together rather than as a collection of completely unrelated effects.
Could they represent different pieces of the same physiological response? That’s the question the researchers want future studies to investigate.
Stress Can Sometimes Be Good for You
Here’s where things get particularly interesting.
The PiPS theory draws on a biological concept called hormesis. Essentially, hormesis describes the idea that a small amount of stress can sometimes stimulate the body to become more resilient.
Exercise is a familiar example. A workout temporarily stresses the body, but the process of recovering from that stress can make muscles and other systems stronger. Fasting and controlled exposure to cold are also sometimes discussed in similar terms: a manageable challenge prompts the body to adapt.
The researchers suggest psychedelics could potentially trigger a comparable process.
A psychedelic experience can temporarily alter physiological processes, including the stress response. Cortisol, for example, may increase during the acute effects of psilocybin. While chronic stress and chronically elevated cortisol can be harmful, a short-lived stress response is a normal part of the body’s adaptive machinery.
The authors propose that this temporary disruption could activate pathways involved in recovery and recalibration. In other words, the stress response might be part of the process rather than simply an unwanted side effect.
From Cortisol to the Gut: The Whole-Body Picture
The proposed PiPS model brings together several biological systems.
One is the immune system. Previous psychedelic studies have reported changes in inflammatory markers, including TNF-α, IL-6 and C-reactive protein. Some research has also found reductions in these markers following psychedelic administration, although exactly what this means for long-term health remains an open question.
Then there’s the autonomic nervous system, which controls many of the body’s automatic functions, including heart rate and digestion.
The vagus nerve may be relevant here too, providing a major communication route between the brain and organs throughout the body.
The researchers also discuss oxytocin signalling, the gut microbiome, mitochondrial function, sigma-1 receptors and BDNF, a protein associated with plasticity and cellular growth.
None of these mechanisms has been established as the explanation for psychedelic effects. Instead, they represent possible pieces of a much bigger biological puzzle. And that’s precisely what makes the PiPS hypothesis interesting.
Meet “Bodyset”
Anyone familiar with psychedelic culture has probably heard of set and setting. Set refers to your mindset going into an experience, while setting refers to the physical and social environment around you.
The authors of this paper suggest that there could be another piece of the puzzle: bodyset.
Bodyset describes the physiological condition you bring into the experience. Sleep, stress, inflammation, metabolism, immune activity and autonomic balance could potentially influence how the body responds to a psychedelic — and what happens afterwards.
This makes intuitive sense when you consider how different an experience can feel depending on whether you’re rested, exhausted, anxious, hungry or physically unwell.
The idea also raises an interesting question for psychedelic therapy: should researchers be paying as much attention to physiological preparation as they do to psychological preparation?
Could Psilocybin Help the Body Become More Flexible?
Now for a lil’ disclaimer: the PiPS concept is currently a theoretical framework, not a proven biological phenomenon.
The authors are bringing together findings from neuroscience, immunology, endocrinology and physiology and proposing that they could fit into a broader model, rather than presenting a clinical trial demonstrating that psilocybin resets the immune system, repairs mitochondria or treats chronic inflammation
The next step is testing this concept.
Future psychedelic studies could measure things such as inflammatory cytokines, cortisol, heart-rate variability and immune activity alongside psychological outcomes.
If these measurements consistently change together around psychedelic experiences (and particularly if those changes predict longer-term improvements) it would provide stronger evidence for the PiPS theory.
A New Way of Thinking About Psychedelic Healing
The most exciting part of this idea may ultimately be the shift in perspective it represents. Psychedelics are often discussed as tools for ‘changing’ the mind. But humans aren’t brains floating around inside bodies. Mental states, hormones, immune function, metabolism and the nervous system are constantly communicating.
Perhaps psychedelic experiences work partly because they interact with this entire network.
The PiPS hypothesis offers one possible explanation: psychedelics could temporarily open a window of increased physical adaptability, much like they appear to create windows of psychological flexibility.
As psychedelic science moves beyond simply asking “What happens in the brain?”, questions about the rest of the organism are becoming more relevant and the findings more and more fascinating.
The next chapter of psychedelic research may therefore be less about the mind versus the body — rather it will be about what happens when we stop treating the two as separate.
