Faculty profile

Thomas Walters

ResearcherPediatric Gastroenterology and NutritionUniversity of Toronto

This profile is built from public research funding records (CIHR, NSERC and SSHRC) and PubMed. We have not imported them from a University of Toronto directory, so their courses and email address may be missing. Find their university profile.

Thomas Walters

Researcher

Pediatric Gastroenterology and Nutrition

Health Sciences

University of Toronto

Toronto, Ontario, Canada

Supervision signals

Has led research grants, which requires an independent research appointment. Ask their department whether they supervise graduate students.
8 publications in the last five years, latest in 2026.
Principal investigator on 4 research grants (4 CIHR), most recently in 2021.

These signals come from public records, including CIHR, NSERC and SSHRC funding decisions. Ask the professor or the graduate program whether they are taking new students.

Academic metrics

Publications

138

Citations

Collaborators

Grants

Publications by year

Counts cover the publications linked to this profile. Citations and the h-index appear when the source records them.

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Signals and details

Research

Inflammatory Bowel Disease Pediatrics Inception Cohort Longitudinal Prospective Multicenter Network Environment Genetic Susceptibility Microbiome

Latest papers

Sample size calculation for training ensemble machine learning models on health data.
Patterns (New York, N.Y.) · 2026
Using machine learning to predict clinical remission with exclusive enteral nutrition in pediatric Crohn disease.
Journal of pediatric gastroenterology and nutrition · 2026
Early Life Exposure to Parental Crohn’s Disease Is Associated With Offspring’s Gut Microbiome, Gut Permeability, and Increased Risk of Future Crohn’s Disease
Gastroenterology · 2025

All 33 publications

Latest funding

Unravelling the Cellular and Immunologic Landscape of the Gut in Children with Primary Sclerosing Cholangitis at Single-Cell Resolution
CIHR · 2024 · Co-investigator
$822,376
IMAGINE (Inflammation, Microbiome, and Alimentation: Gastro-Intestinal and Neuropsychiatric Effects) SPOR Chronic Disease Network - Knowledge Mobilization & Implementation Science Phase 2
CIHR · 2021 · Principal investigator
$3,745,000
Role of microbes in the pathogenesis of PIBD: From discovery, through causation, to novel treatments
CIHR · 2019 · Co-investigator
$2,000,000

All 8 grants and awards

33 publications.

Sample size calculation for training ensemble machine learning models on health data.

Mitsakakis N, Liu D, Walters T, El Emam K

Patterns (New York, N.Y.)2026

DOI: 10.1016/j.patter.2026.101498 PMID: 42328195

Using machine learning to predict clinical remission with exclusive enteral nutrition in pediatric Crohn disease.

Suarez RGS, McClement DG, Vega R, Huynh HQ, Shaikh A, Otley A, Jacobson K, Sherlock M, Mack DR, Deslandres C, El-Matary W, Crowley E, deBruyn J, Walters T, Griffiths AM, Greiner R, Eytan Wine, Canadian Children IBD Network

Journal of pediatric gastroenterology and nutrition2026

DOI: 10.1002/jpn3.70299 PMID: 41318965

Early Life Exposure to Parental Crohn’s Disease Is Associated With Offspring’s Gut Microbiome, Gut Permeability, and Increased Risk of Future Crohn’s Disease

Lee S-H, Bushra M, Qiu L, Griffiths AM, Turpin W, Croitoru K, Lee S-H, Bushra M, Qiu L, Shao J

Gastroenterology202518 citations

DOI: 10.1053/j.gastro.2024.09.033

Neutrophil-to-Lymphocyte Ratio at Diagnosis Predicts Colonoscopic Activity in Pediatric Inflammatory Bowel Diseases.

Aziz B, Belaghi R, Huynh H, Jacobson K, Mack DR, Deslandres C, Otley A, DeBruyn J, El-Matary W, Crowley E, Sherlock M, Critch J, Ahmed N, Griffiths A, Walters T, Wine E, Canadian Children IBD Network

Clinical and translational gastroenterology2025

DOI: 10.14309/ctg.0000000000000824 PMID: 39835685

Myointimal hyperplasia of the mesenteric veins mimicking inflammatory bowel disease in a 13-year-old patient.

Abuquteish D, Chami R, Chavhan GB, Walters T, Siddiqui I

JPGN reports2024

DOI: 10.1002/jpr3.12130 PMID: 39610418

Linking microbial genes to plasma and stool metabolites uncovers host-microbial interactions underlying ulcerative colitis disease course.

Schirmer M, Stražar M, Avila-Pacheco J, Rojas-Tapias DF, Brown EM, Temple E, Deik A, Bullock K, Jeanfavre S, Pierce K, Jin S, Invernizzi R, Pust MM, Costliow Z, Mack DR, Griffiths AM, Walters T, Boyle BM, Kugathasan S, Vlamakis H, Hyams J, Denson L, Clish CB, Xavier RJ

Cell host & microbe2024

DOI: 10.1016/j.chom.2023.12.013 PMID: 38215740

Anti TNF treatment of complex perianal fistulas in children without luminal Crohn's disease: Is it an option?

Rinawi F, Greer MC, Walters T, Church PC, Ricciuto A, Langer JC, Griffiths AM

Journal of pediatric surgery2022

DOI: 10.1016/j.jpedsurg.2022.03.031 PMID: 35491271

Clinical and Host Biological Factors Predict Colectomy Risk in Children Newly Diagnosed With Ulcerative Colitis.

Hyams JS, Brimacombe M, Haberman Y, Walters T, Gibson G, Mo A, Mack D, Griffiths A, Boyle B, LeLeiko N, Markowitz J, Rosh J, Patel A, Shah S, Baldassano R, Pfefferkorn M, Sauer C, Dailey J, Venkateswaran S, Kugathasan S, Denson LA

Inflammatory bowel diseases2022

DOI: 10.1093/ibd/izab061 PMID: 33904583

Vitamin D deficiency enhances expression of autophagy-regulating miR-142-3p in mouse and "involved" IBD patient intestinal tissues.

McGillis L, Bronte-Tinkew DM, Dang F, Capurro M, Prashar A, Ricciuto A, Greenfield L, Lozano-Ruf A, Siddiqui I, Hsieh A, Church P, Walters T, Roth DE, Griffiths A, Philpott D, Jones NL

American journal of physiology. Gastrointestinal and liver physiology2021

DOI: 10.1152/ajpgi.00398.2020 PMID: 34159811

Development and Validation of the Mucosal Inflammation Noninvasive Index For Pediatric Crohn's Disease.

Cozijnsen MA, Ben Shoham A, Kang B, Choe BH, Choe YH, Jongsma MME, Russell RK, Ruemmele FM, Escher JC, de Ridder L, Koletzko S, Martín-de-Carpi J, Hyams J, Walters T, Griffiths A, Turner D

Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association2020

DOI: 10.1016/j.cgh.2019.04.012 PMID: 30981008

Unravelling the Cellular and Immunologic Landscape of the Gut in Children with Primary Sclerosing Cholangitis at Single-Cell Resolution

Co-investigatorCIHR2024Project Grant

Principal investigators: Ricciuto, Amanda; Bader, Gary D; MacParland, Sonya

Keywords: Colitis; Inflammatory Bowel Disease (Ibd); Machine Learning; Paediatric; Primary Sclerosing Cholangitis (Psc); Screening; Single-Cell Transcriptomics

$822,376

IMAGINE (Inflammation, Microbiome, and Alimentation: Gastro-Intestinal and Neuropsychiatric Effects) SPOR Chronic Disease Network - Knowledge Mobilization & Implementation Science Phase 2

Principal investigatorCIHR2021SPOR Networks - Knowledge Mobilization and Implementation Science

Principal investigators: Moayyedi, Paul; Calliou, Skylin N; Daley, Kimberlee; De Nino, Alysia; Desjarlais, Rhonda; Marsiglio, Megan L; Munro, Sandra; Baumgart, Daniel C; Bercik, Premysl; Bernstein, Charles N; de Souza, Russell J; Dieleman, Levinus A; D'Silva, Adrijana; Ghia, Jean-Eric; Graff, Lesley A; Jones, Meaghan J; Kao, Dina H; Lavis, John N; Leontiadis, Grigorios; Libertucci, Josie; Ma, Christopher; Madsen, Karen L; Marshall, Deborah A; Narula, Neeraj; Nguyen, Geoffrey C; Otley, Anthony R; Panaccione, Remo; Pena-Sanchez, Juan-Nicolas; Presseau, Justin; Ruzycki, Shannon M; Surette, Michael G; Swain, Mark G; Tandon, Puneeta; Taylor, Valerie Hannah; Tremblay, Melissa; Tripp, Dean A; Vanner, Stephen J; Verdu, Elena F; Walters, Thomas D; Wine, Eytan

Keywords: Anxiety; Depression; Diet; Implementation Science; Inflammatory Bowel Disease; Irritable Bowel Syndrome; Knowledge Mobilization; Microbiome; Patient Orientated Research

$3,745,000

Role of microbes in the pathogenesis of PIBD: From discovery, through causation, to novel treatments

Co-investigatorCIHR2019Team Grant: Canadian Microbiome Initiative 2: Research Teams - IHDCYH Pool

Principal investigators: Vallance, Bruce A; Griffiths, Anne Marie; Mack, David R; Muise, Aleixo M; Parkinson, John; Ricciuto, Amanda; Surette, Michael G; Tropini, Carolina; Wine, Eytan

Keywords: Children; Inflammatory Bowel Disease; Microbiome; Mucus; Multi-Omics; Nutrition; Organoids; Pathobionts; Pediatrics; Therapeutic Interventions

$2,000,000

Role of microbes in the pathogenesis of PIBD: From discovery, through causation, to novel treatments

Co-investigatorCIHR2018Team Grant: Canadian Microbiome Initiative 2: Research Teams - LOI

Principal investigators: Vallance, Bruce A; Griffiths, Anne Marie; Mack, David R; Muise, Aleixo M; Parkinson, John; Tropini, Carolina; Wine, Eytan

Keywords: Children; Inflammatory Bowel Disease; Mucus; Multiomics; Nutrition; Organoids; Pathobionts; Therapeutic Interventions

$25,000

Economic Evaluation of Early Intervention with anti-Tumour Necrosis Factor Alpha Medications in Children with Crohn's disease

Co-investigatorCIHR2014Operating Grant

Principal investigators: Ungar, Wendy J

Keywords: Anti-Tumour Necrosis Alpha Drugs; Child Health; Cost-Effectiveness Analysis; Crohn'S Disease; Decision Analysis; Drug Policy; Health-Related Quality Of Life; Immunomodulators; Qaly; Utilities For Pediatric Health States

$100,000

Canadian Children Inflammatory Bowel Disease Network

Principal investigatorCIHR2012CH.I.L.D.-CIHR Inflammatory Bowel Disease Network - LOI

Principal investigators: Griffiths, Anne Marie; Benchimol, Eric I; Jacobson, Kevan; Kaplan, Gilaad G; Mack, David R; Muise, Aleixo M; Otley, Anthony R; Seidman, Ernest G; Vallance, Bruce A; Walters, Thomas D; Waterhouse, Christopher C; Wine, Eytan

Keywords: Inception Cohort; Inflammatory Bowel Disease; Longitudinal Prospective; Multicenter Network; Pediatrics

$15,000

Canadian Children Inflammatory Bowel Disease Network: A Joint Partnership of CIHR and the C.H.I.L.D. Foundation

Principal investigatorCIHR2012CH.I.L.D.-CIHR Inflammatory Bowel Disease Network

Keywords: Environment; Genetic Susceptibility; Inflammatory Bowel Disease; Microbiome; Outcomes; Pediatrics

Systems biology of pediatric inflammatory bowel disease: contribution of the gut microbiota

Principal investigatorCIHR2009Canadian Microbiome Initiative - LOI

Principal investigators: Stintzi, Alain; Britz-Mckibbin, Philip; Figeys, Daniel; Griffiths, Anne Marie; Hajibabaei, Mehrdad; Jacobson, Kevan; Mack, David R; Muise, Aleixo M; Otley, Anthony R; Vallance, Bruce A; Walters, Thomas D

Keywords: Children; Gut Microbiome; Inflammatory Bowel Disease; Systems Biology

From CIHR, NSERC and SSHRC funding decisions: CIHR since 2008, NSERC since 1991 and SSHRC since 1998, including their latest published competition results.

Write to this professor

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Applying for

Paper to mentionMention their CIHR grant from 2021

Subject: Prospective PhD student: Inflammatory Bowel Disease Dear Professor Walters, My name is [your name], and I am a [your current degree or role] at [your institution]. I am applying for a PhD position starting in [term and year]. I read your paper "Sample size calculation for training ensemble machine learning models on health data." (2026), and it connects closely to my own work on [your research topic]. [One or two sentences on what you did and what you learned.] I also saw your CIHR-funded project "IMAGINE (Inflammation, Microbiome, and Alimentation: Gastro-Intestinal and Neuropsychiatric Effects) SPOR Chronic Disease Network - Knowledge Mobilization & Implementation Science Phase 2" (2021), and I would be glad to contribute to work in that direction. Are you accepting new PhD students for [term and year]? I have attached my CV and transcripts, and I would be glad to talk at a time that suits you. Thank you for your time. Kind regards, [your name]

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Thomas Walters

Research

Latest papers

Latest funding

Sample size calculation for training ensemble machine learning models on health data.

Using machine learning to predict clinical remission with exclusive enteral nutrition in pediatric Crohn disease.

Early Life Exposure to Parental Crohn’s Disease Is Associated With Offspring’s Gut Microbiome, Gut Permeability, and Increased Risk of Future Crohn’s Disease

Neutrophil-to-Lymphocyte Ratio at Diagnosis Predicts Colonoscopic Activity in Pediatric Inflammatory Bowel Diseases.

Myointimal hyperplasia of the mesenteric veins mimicking inflammatory bowel disease in a 13-year-old patient.

Linking microbial genes to plasma and stool metabolites uncovers host-microbial interactions underlying ulcerative colitis disease course.

Anti TNF treatment of complex perianal fistulas in children without luminal Crohn's disease: Is it an option?

Clinical and Host Biological Factors Predict Colectomy Risk in Children Newly Diagnosed With Ulcerative Colitis.

Vitamin D deficiency enhances expression of autophagy-regulating miR-142-3p in mouse and "involved" IBD patient intestinal tissues.

Development and Validation of the Mucosal Inflammation Noninvasive Index For Pediatric Crohn's Disease.

Frequent collaborators

Anne Griffiths

David Mack

Anthony Otley

John Kenneth Marshall

Paul Moayyedi

Amanda Ricciuto

Anne Griffiths

Kenneth Croitoru

Osvaldo Espin Garcia

Ramzi Fattouh

Wei Xu

Karen Madsen

Michael Surette

Frances Tse

Eytan Wine

Khaled El Emam

Remo Panaccione

Anne Dipchand

Eytan Wine

Rahim Moineddin

Bruce Vallance

Daniela Rotin

Levinus Dieleman

Gilaad Kaplan

Philip Sherman

Kevan Jacobson

David Mack

Michael Glogauer

Paul Beck

Dana Philpott

Mary-Louise Greer