A groundbreaking clinical study published in October 2025 by Israel's world-renowned Hadassah Medical Organization has turned heads in both the medical and psychological communities. Participants who underwent a hypnosis-based simulation of gastric sleeve surgery — without a single incision or drop of anaesthetic — lost an average of 10% of their body weight. That result sits comfortably in the same range as outcomes reported for actual bariatric surgery and several approved weight-loss medications.
What the Study Found
Forty-one participants took part in this first-of-its-kind trial at Hadassah's Mount Scopus campus in Jerusalem. Each person completed six sessions: preparatory appointments, the central simulated surgery experience, and guided self-hypnosis practice. They also received monthly phone support for a year and periodic blood tests measuring ghrelin (the hunger hormone) and leptin (the fullness hormone), alongside nutritional guidance mirroring the support given to real post-surgical patients.
During the core 50-minute session — with patients dressed in surgical gowns, connected to monitors, and a needle-free IV in place for authenticity — participants entered a guided hypnotic state. A licensed hypnotherapist then walked them through every stage of a gastric sleeve procedure as though it were physically occurring, encouraging vivid mental simulation of the operation. The result: the mind began to experience feelings of increased fullness, improved self-control, and stronger motivation that carried forward into real eating behaviour.
Three months post-procedure, preliminary data revealed that 86% of participants continued to lose weight. Among those who had previously undergone weight-loss surgery and subsequently regained weight, 66% lost more than 20% of their excess pounds. Even among those who had never had any form of bariatric surgery, 55% achieved a similar milestone — a result researchers described as comparable to surgical outcomes.
The Science Behind the Simulation
This study is led by a genuinely multidisciplinary team: bariatric surgeons, a psychiatrist specialising in medical hypnosis, a metabolism researcher from Hebrew University, and psychologist Maya Mizrahi, who developed and runs the intervention. The involvement of bariatric surgeons is significant — they are experts in what gastric sleeve surgery actually achieves physiologically, and their endorsement of the hypnosis protocol speaks to how seriously the team takes the biological parallels.
Gastric sleeve surgery physically reduces the stomach to a narrow tube, limiting food intake and triggering hormonal changes that suppress appetite. Hadassah's team hypothesised — and appear to be confirming — that a sufficiently vivid mental simulation of this process can activate many of the same neurological and hormonal pathways. Early hormone data tracking ghrelin and leptin levels will, when published in full, likely shed considerable light on the mechanisms at work.
Lead researcher Dr Mizrahi was clear on the nature of the work: "Hypnosis is not a magic trick. The goal is not only to create a surgical experience but also to strengthen the patients' sense of capability and teach them to listen to their bodies." That framing matters. This is not about tricking the brain — it's about reshaping the deeply held beliefs and physical responses that govern eating behaviour.
Why This Matters for Everyday People Struggling with Weight
Bariatric surgery is life-changing for many, but it carries real risks: anaesthesia, surgical complications, recovery time, and significant lifestyle restrictions post-operation. Access is also limited — long NHS waiting lists, cost barriers for private patients, and strict eligibility criteria mean millions of people who could benefit never get the procedure.
A hypnosis-based intervention that produces comparable short-term results — no scalpel, no hospital stay, no post-surgical complications — would be a genuine paradigm shift in how we approach weight management. The Hadassah study is still ongoing, with full results expected within a year, but the preliminary data is striking enough to have attracted significant media attention globally.
Importantly, this research adds to a growing body of evidence that the mind's influence over physical appetite and metabolism is far deeper than previously understood. Earlier studies have shown hypnotherapy improving eating behaviours, reducing emotional eating, and helping people sustain dietary changes — but a direct hormonal comparison to surgical outcomes is new territory entirely.
How Clear Minds Can Help You Right Now
While Hadassah's virtual gastric sleeve trial remains in research phase, the core principle it demonstrates — that the subconscious mind can profoundly reshape eating habits, hunger responses, and motivation — is exactly what Clear Minds is built on.
The Clear Minds app uses clinically-informed hypnotherapy audio sessions designed to address the subconscious patterns that drive overeating, emotional eating, and weight gain. Sessions work to reframe the relationship with food at the level where habits are actually formed: beneath conscious thought. Many users report reduced cravings, a natural shift toward smaller portions, and a new sense of control around food — without dieting, willpower battles, or restriction.
You don't need surgery to access the weight-loss power of your own mind.
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The Bigger Picture
The Hadassah trial joins a growing list of high-quality research validating hypnotherapy's role in addressing complex health challenges. From NHS-backed surgical pain protocols to Stanford brain imaging studies, the science is increasingly clear: hypnosis is a legitimate, measurable, and remarkably flexible therapeutic tool.
As researchers await the full results of this trial — including the hormone data — the field will be watching closely. If the final findings hold, the idea of a "hypnotic gastric sleeve" may move from the pages of research journals into mainstream clinical practice faster than many expect.
Source: Hadassah Medical Organization press release, October 2025. Study ongoing; preliminary results presented at Hadassah's Mount Scopus campus. Full publication pending peer review.
