The Sanctuary Thailand wellness centre nestled between jungle and ocean on Koh Phangan
How to Reset Your Gut: A Science-Backed Guide to Gut Cleansing
Your gut is talking. Are you listening?
Discover the remarkable process that happens when you stop eating for a day or two. While most people focus on the feeling of hunger, the real transformation is happening inside — in the trillions of microorganisms that call your gut home.
Your gut microbiome is more than a digestive engine. It regulates your immune system, influences your mood, affects the clarity of your thinking, and plays a role in nearly every chronic condition researchers have studied in the last decade. Unfortunately the modern lifestyle, which for many people consists of processed food, stress, alcohol, mold and environmental toxins, has a damaging effect on our microbiome. As our gut health diminishes, the effects ripple outward into your energy, skin, sleep and emotional resilience.
A gut cleanse, done properly and supervised, creates the conditions for your body to do what it already knows how to do: heal.
What is a gut cleanse, really?
The term “gut cleanse” gets mentioned a lot in wellness circles—from juice cleanses to supplement protocols to full therapeutic fasting programs. At its core, a genuine gut cleanse has three goals:
- Digestive Rest: In the absence of food, the digestive system has space to rest from the constant work of breaking down food, so it can redirect energy toward repair.
- Clear Accumulated Waste: Support the body’s natural elimination of toxins, undigested matter, and microbial imbalance through the liver, kidneys, intestines, and skin.
- Restore Microbial Balance: Replenish the gut with beneficial bacteria and create the internal environment for a diverse, resilient microbiome.
It’s important to remember: your body already has the systems to detoxify itself. The liver, kidneys, intestines, lungs, and skin are constantly working to process and eliminate waste. A well-designed cleanse provides a supportive environment—through nutritional support, rest and extra tools like sauna and colonics—for your natural systems to function at their best.
What the science says: Fasting and your microbiome
Research in the field of the gut microbiome has accelerated dramatically. Here is what we know:
Fasting reshapes the gut bacteria
A 2021 study published in Nature Communications found that fasting led to significant shifts in gut microbiome composition in patients with metabolic syndrome. These shifts were directly associated with reductions in blood pressure and body weight. The researchers described fasting as a “promising non-pharmacological intervention,” not just for weight management, but for cardiovascular health driven by microbiome changes.
More recently, a 2025 study published in PubMed Central demonstrated that fasting produced “gut microbiome signature changes” that extend to patients with Type 1 diabetes. Fasting could bring the gut microbiome of these patients closer to that of healthy controls, suggesting that the therapeutic reach of fasting extends beyond digestion and into overall health.
Autophagy: Your body’s built-in repair system
After approximately 24 to 48 hours without food, your body activates a process called autophagy — a cellular mechanism where old, damaged, or dysfunctional cells are broken down and recycled. The word itself comes from the Greek for “self-eating,” and the process earned Yoshinori Ohsumi the Nobel Prize in Physiology in 2016.
Fiber and fermented foods rebuild what fasting clears
A landmark 2021 study from Stanford, published in Cell, found that participants who followed a high-fermented-food diet for 10 weeks experienced increased microbial diversity and reduced levels of inflammatory markers, including IL-6. This is significant because low microbial diversity and chronic inflammation are two hallmarks of poor gut health.
Prebiotic fibers, such as psyllium husk, inulin, and fructo-oligosaccharides, act as food for beneficial bacteria. A 2019 clinical study confirmed that psyllium supplementation increased the production of short-chain fatty acids (SCFAs) in the colon, which are essential for maintaining the integrity of the gut lining and regulating immune function.
This is why the most effective gut cleanse programs don’t just fast—they follow the fast with deliberate reintroduction of probiotics and prebiotic-rich foods.
Fresh green juice and herbal elixirs prepared daily at The Sanctuary Thailand’s Wellness Centre
What a gut cleanse looks like at The Sanctuary
At The Sanctuary, our therapeutic fasting and detox program was designed around the principles presented thus far, long before most of the studies cited here were published. For over 30 years, we have refined a liquid-only cleanse that combines modern science with the ancient wisdom of herbal medicine, fasting, and holistic care.
The daily protocol:
Our program is built on a structured schedule of functional drinks, herbal supplements, and self-administered colonics, all designed to work together:
Some of our drinks include:
– Psyllium and bentonite clay shakes: Taken throughout the day to bind toxins and support elimination
– Green juice: Made from cucumber, celery, coriander, mustard greens, ginger, and lime — designed to hydrate at a cellular level, mobilise heavy metals, and activate liver detoxification
– Mineral-dense vegetable broth: Provides electrolytes. Served with spirulina, turmeric, moringa, garlic, miso, and lime.
Our herbal supplements are formulated with triphala, turmeric, noni and other traditional botanicals that support the body’s detoxification pathways.
The program also includes daily colonics which are available with coffee, neem, or probiotic solutions. Colonics help further clear accumulated waste that fasting mobilises.
Beyond the physical:
A gut cleanse isn’t just about what goes into your body. Research consistently shows that stress directly impacts the gut microbiome through the gut-brain axis. This is why our program includes daily yoga and fitness classes, infrared sauna, herbal steam room, massage, and the simple, powerful medicine of being in nature.
The Sanctuary sits on a remote, car-free bay on Koh Phangan — accessible only by boat or jungle truck. There are no roads, no traffic, no rush. The jungle meets the ocean, and the environment itself becomes part of the cleanse.
Grounding, which is the practice of making direct physical contact with the earth, has been shown to reduce stress hormones and inflammation. At The Sanctuary, it happens naturally: walking barefoot through jungle paths and swimming in the ocean.
After the cleanse: Why reintroduction matters
Perhaps the most overlooked part of any gut cleanse is what happens after. The post-cleanse period is when your gut is most receptive to change. Following a protocol of daily colonics and multiple days of intaking detoxifying herbs, the microbial state has been cleared and the environment is primed for recolonization by beneficial bacteria.
This is why we provide every guest with a post-cleanse protocol that includes:
- Guided food reintroduction: We guide guests on how to properly reintroduce solid food after the detox, starting with easily digestible foods, and fermented foods to colonize the gut with beneficial bacteria.
- Post-detox probiotics: Helps to seed the gut with beneficial organisms.
- Education on digestion and sustainable eating: We equip guests with knowledge about healthy eating and optimal digestion habits to extend the benefits of the cleanse well beyond their stay.
The goal of our gut cleanse is not a temporary fix. It is a deep reset that provides the body with a new baseline from which healthier habits can grow.
Is a gut cleanse right for you?
A gut cleanse may be worth considering if you are experiencing:
- Persistent bloating, gas, or digestive discomfort
- Low energy or brain fog
- Skin issues like breakouts or irritation
- Difficulty losing weight despite reasonable effort
- A general feeling of being “stuck” — physically or mentally
- Recovery from a period of poor diet, travel, antibiotics, or high stress
Our programs range from 3.5 to 10.5 days, with options for those who prefer a gentler approach (our Gentle Cleanse includes one light meal per day). Intensive overlays are also available for specific concerns including parasite cleanse, candida cleanse, heavy metal cleanse, and liver flush.
Begin your reset
Your gut microbiome is living with you—it responds to what you eat, how you live, and your environment. The science is clear on how fasting reshapes the microbiome, reduces inflammation, and activates your body’s own repair systems. A retreat provides the time, structure and support to allow the body’s own process to unfold fully. The Sanctuary is a particularly special environment to undergo a retreat because of its remote, off-grid nature—a place to fully immerse in the elements for a full mind, body, soul reset.
If you’re ready to give your body the space to heal, we would love to welcome you.
Explore our detox programs: https://thesanctuarythailand.com/detox-packages/
View accommodation options: https://thesanctuarythailand.com/accommodations/
References:
- Maifeld, A., et al. (2021). “Fasting alters the gut microbiome reducing blood pressure and body weight in metabolic syndrome patients.” *Nature Communications*, 12, 1970. [nature.com/articles/s41467-021-22097-0](https://www.nature.com/articles/s41467-021-22097-0)
- Thingholm, L.B., et al. (2025). “Fasting elicits gut microbiome signature changes that extend to type 1 diabetes patients.” *PubMed Central*. [pmc.ncbi.nlm.nih.gov/articles/PMC12380539](https://pmc.ncbi.nlm.nih.gov/articles/PMC12380539/)
- Wastyk, H.C., et al. (2021). “Gut-microbiota-targeted diets modulate human immune status.” *Cell*, 184(16), 4137–4153.
- Jalanka, J., et al. (2019). “The Effect of Psyllium Husk on Intestinal Microbiota in Constipated Patients and Healthy Controls.” *International Journal of Molecular Sciences*, 20(2), 433. [pmc.ncbi.nlm.nih.gov/articles/PMC6358997](https://pmc.ncbi.nlm.nih.gov/articles/PMC6358997/)
- Digestive Disease Week 2025 Poster Session. “Fasting Remodels the Colonic Microbiota and Increases Goblet Cell Autophagy to Preserve the Mucus Barrier.” [pmc.ncbi.nlm.nih.gov/articles/PMC12900830](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12900830/)
- Ohsumi, Y. (2016). Nobel Prize in Physiology or Medicine — for discoveries of mechanisms for autophagy.
- Sayed, A., et al. (2025). “Metabolic reset purification program improves antioxidant balance and gut microbiome.” *Frontiers in Nutrition*. [frontiersin.org/articles/10.3389/fnut.2025.1621709](https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1621709/full)
- Cleveland Clinic. “Autophagy: What It Is, Benefits & How to Induce.” [my.clevelandclinic.org](https://my.clevelandclinic.org/health/articles/24058-autophagy)
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*This article is for educational purposes only and does not constitute medical advice. Consult your healthcare provider before beginning any fasting or cleanse program, particularly if you have existing health conditions or take medication.*
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