Our Toronto functional medicine providers aim to meet the demands of personalized patient care. One topic that our patients frequently learn about is gut health – this makes sense to us, as the microbiome can be foundational to overall wellness!
From early probiotics to fecal microbiota transplants, this article explores the evolution of microbiome-based therapies. We also highlight the cutting-edge rise of postbiotics and what to expect from our functional medicine consultations.
Early Promise (and Pitfalls) of Probiotics
Probiotics were discovered in the early 1900s by French chemist Louis Pasteur. These supplements were commercially launched in 1935; in 1953, a German bacteriologist named Werner Kollath titled these supplements as “probiotic”, which means “for life” from Latin and Greek derivatives.
When the early 2000s arrived, countless studies were conducted to scrutinize the intricate interplay between probiotics and gut microbiota. As the field of microbiome research expanded, a critical realization emerged – not all probiotics work the same for everyone.
Each individual’s microbiome is as unique as a fingerprint, meaning that generic probiotic formulas often yield inconsistent results. Findings have shown that, for some patients, probiotics can pass through the gut without colonizing or providing long-term benefit. In functional medicine clinics, healthcare providers began to see that high-dose, multi-strain probiotics were not a one-size-fits-all solution to digestive health concerns.
Fecal Microbiota Transplantation (FMT): A Paradigm Shift in Microbial Therapy
Fecal microbiota transplantation (FMT) has dramatically shifted the narrative of gut health care, especially in 1958, when the first FMT procedure was conducted.
Once considered fringe, FMT became mainstream following its success in treating recurrent C. difficile infections. This method — which involves transferring stool from a healthy donor into the patient’s colon — proved that microbial communities could reset the gut in profound ways. Along with treating C. difficile, scientists posit that FMT could influence obesity, aging, and immune function. These insights offer a new view of the microbiome — not just as a digestive “partner”, but as a systemic regulator that can impact brain health, inflammation, and hormonal balance.
The Birth of Postbiotics
“Recently, scientific studies have been looking into FMT as a promising treatment of various diseases, while in the process teaching us about the interaction between the human host and its resident microbial communities.”
– Gut Microbes, 2017
When the COVID-19 pandemic halted FMT procedures, researchers and clinicians explored additional treatment options for gut optimization. One innovation involved autoclaving donor stool, creating a sterile preparation devoid of live microbes, yet rich in bacterial metabolites. The surprising success of this method pointed to a new frontier: postbiotics!
Postbiotics refer to the non-living byproducts or components of microbes — compounds such as short-chain fatty acids, peptides, and cell wall fragments —that interact with the host’s immune and metabolic systems. These molecules represent the “language” through which the microbiome communicates with the human body. Originally defined as heat-killed probiotic cells or their byproducts, postbiotics have now expanded to include any functional metabolite produced by gut microbes. These include butyrate (which helps fuel colon cells), indole propionic acid (to help tighten the gut barrier), and various immunomodulatory molecules that regulate inflammation and T-cell function.
The potential synergy between postbiotics and the immune system is particularly exciting. In fact, research has shown that certain postbiotic molecules can enhance the efficacy of immunotherapy in cancer patients or reduce systemic inflammation.
Toronto area Functional medicine doctors are aware of postbiotics, and these may be inquired for targeting compromised immunity or a lack of tolerance to probiotics. Postbiotics can be integrated into treatment plans for chronic stress, irritable bowel syndrome, chronic fatigue, or for managing an autoimmune condition.
A New Era in Gut Health
A healthy microbiome is not just disease-free – it is diverse, resilient, and metabolically active, and an integrative treatment approach shows promise in supporting your natural healing process.
Postbiotics – while still emerging – brings together ancient wisdom and modern science. If you want to learn more about these or new strategies for targeting health concerns via the gut, our clinicians are proficient in adapting functional medicine therapies. Our gut health therapies can be integrated with conventional treatment methods, as well as psychotherapy, herbal supplementation, holistic nutrition, naturopathic medicine and homeopathic medicine.
Suggested reading: Understanding the Risks for Mold Exposures: A Functional Medicine Toronto Discussion
What to Expect from our Functional Medicine Consultations
If you need to take control of your health status, we can help you investigate unique ways to tackle your health challenges.
Our comprehensive approach to healthcare can be accessed in the Yorkville neighbourhood in Toronto. When you first join our clinic as a new patient, an initial consultation is mandated and it may be conducted in-person or virtually. Here’s what we’ll discuss at your first appointment:
- What your health goals are (i.e. improving stress management or tissue repair for sports)
- Lifestyle factors (i.e. diet, exercise, smoking status, etc.)
- Potential exposures to environmental toxins (i.e. BPA from plastics)
- Medical history
- Genetic factors
- Laboratory testing, which may be advised to further understand your unique microbiome, nutrient deficiencies, food sensitivities, etc.
Our clinicians can also prescribe intravenous therapy for adjuvant measures, and these treatments are administered in our IV Lounge. We do not blend IV drips with preservatives – we only use fresh ingredients! Each drip session is supervised by our wellness team, which includes naturopathic doctors, nurse practitioners and registered nurses. Combining IV therapy with healthy lifestyle modifications and additional treatment modalities may be beneficial for supporting optimal health outcomes. We take a personalized approach to IV dosages, which means that we prescribe drip treatments for your biology only.
Customized treatment plans can target your current health needs for the mind and body. If you need motivation to work towards your health goals, we’ve got your back! Simply contact the Toronto Functional Medicine Centre now to request an appointment.
Disclaimer: The information in this article is designed for educational purposes only and is not intended to be a substitute for informed medical advice or care. This information should not be used to diagnose or treat any health problems or illnesses without consulting a doctor. You should always consult with a health care practitioner before relying on any information in this article or on this website. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of information you have read from the Toronto Functional Medicine Centre website or other affiliate media.
References
Baruch, E. N., et al. (2021). Fecal microbiota transplant promotes response in immunotherapy-refractory melanoma patients. Science, 371(6529), 602–609.
Campbell, C., et al. (2020). Bacterial metabolism of bile acids promotes generation of peripheral regulatory T cells. Nature, 581(7809), 475–479.
Davar, D., et al. (2021). Fecal microbiota transplant overcomes resistance to anti–PD-1 therapy in melanoma patients. Science, 371(6529), 595–602.
de Groot PF, Frissen MN, de Clercq NC, Nieuwdorp M. Fecal microbiota transplantation in metabolic syndrome: History, present and future. Gut Microbes. 2017 May 4;8(3):253-267. doi: 10.1080/19490976.2017.1293224. Epub 2017 Feb 27. PMID: 28609252; PMCID: PMC5479392.
“Fecal Microbiota Transplants (FMT): Past, Present and Future” from the American Society for Microbiology, posted February 9, 2024, viewed on May 30, 2025.
Frissen, M N., and M Nieuwdorp. “Fecal Microbiota Transplantation in Metabolic Syndrome: History, Present and Future.” Gut Microbes, vol. 8, no. 3, 2017, p. 253, https://doi.org/10.1080/19490976.2017.1293224. Accessed 30 May 2025.
Gasbarrini, Giovanni MD, PhD*; Bonvicini, Fiorenza MD†; Gramenzi, Annagiulia MD†. Probiotics History. Journal of Clinical Gastroenterology 50():p S116-S119, November/December 2016. | DOI: 10.1097/MCG.0000000000000697
Khoruts, A., et al. (2019). The promise and challenges of microbiome-based therapies. The Journal of Law, Medicine & Ethics, 47(4), 482–504.
Latif, Anam, et al. “Probiotics: Mechanism of Action, Health Benefits and Their Application in Food Industries.” Frontiers in Microbiology, vol. 14, 2023, p. 1216674, https://doi.org/10.3389/fmicb.2023.1216674. Accessed 30 May 2025.
Parker, A., et al. (2022). Fecal microbiota transfer between young and aged mice reverses hallmarks of the aging gut, eye, and brain. Microbiome, 10, 68.
Ridaura, V. K., et al. (2013). Gut microbiota from twins discordant for obesity modulate metabolism in mice. Science, 341(6150), 1241214.
Salminen, S., et al. (2021). Definition of postbiotics: A consensus report of the ISAPP. Nature Reviews Gastroenterology & Hepatology, 18(9), 649–667.
Suez, J., et al. (2018). Post-antibiotic gut mucosal microbiome reconstitution is impaired by probiotics and improved by autologous FMT. Cell, 174(6), 1406–1423.e16.
Zmora, N., et al. (2018). Personalized gut mucosal colonization resistance to empiric probiotics. Cell, 174(6), 1388-1405.e21.
Original article "Toronto Functional Medicine Centre – (416) 968-6961" first appeared in the Toronto Functional Medicine Centre website.
