A photo of Marialena Mouzaki.

Marialena Mouzaki, MD, MSc

  • Medical Director, Advanced Nutrition Services
  • Associate Director, Steatohepatitis Program
  • Fellowship Program Director, Advanced Nutrition Fellowship
  • Professor, UC Department of Pediatrics


MD: National and Kapodistrian Medical School of Athens, Greece, 2005.

Residency: General Pediatrics, Penn State Children's Hospital, Hershey, PA, 2009.

Clinical Fellowship: Hospital for Sick Children, Toronto, ON, Canada, 2010.

Clinical/Research Fellowship: Hospital for Sick Children, Toronto, ON, Canada, 2012.

Teaching Scholars Program: Hospital for Sick Children, Toronto, ON, Canada, 2016.

MSc: University of Toronto, Toronto, ON, Canada, 2012.

Certification: General Pediatrics, 2009; Pediatric Gastroenterology, 2013; National Board of Physician Nutrition Specialists, 2018; National Board of Physician Nutrition Scientists, 2018; Diplomat of the American Board of Obesity Medicine, 2022.



Nutrition and specifically MASLD; pediatric gastroenterology

Services and Specialties

Gastroenterology GI, Steatohepatitis


Pediatric MASLD

Research Areas

Gastroenterology Hepatology and Nutrition

Additional Languages


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Age-related trajectory of bone density in children with intestinal failure: A longitudinal retrospective cohort study. Ali, F; Cole, CR; Hornung, L; Mouzaki, M; Wasserman, H; Kalkwarf, HJ. Journal of Parenteral and Enteral Nutrition. 2023; 47:736-745.

Reply. Mouzaki, M; Xanthakos, S. The Journal of Pediatrics. 2023; 259:113467.

Presence of Alpha 1 Antitrypsin Risk Variants is Not Associated With Histologic Severity of Pediatric NAFLD. Khan, M; Klepper, C; Orkin, S; Arce-Clachar, AC; Bramlage, K; Fei, L; Miethke, A; Kohli, R; Xanthakos, S; Mouzaki, M. Journal of Pediatric Gastroenterology and Nutrition. 2023; 77:166-170.

Weight increase in people with cystic fibrosis on CFTR modulator therapy is mainly due to increase in fat mass. Mouzaki, M; Dupuis, A; Avolio, J; Griffin, K; Ratjen, F; Tullis, E; Gonska, T. Frontiers in Pharmacology. 2023; 14:1157459.

Incidence of Type 2 Diabetes in Children With Nonalcoholic Fatty Liver Disease. Newton, KP; Wilson, LA; Crimmins, NA; Fishbein, MH; Molleston, JP; Xanthakos, SA; Behling, C; Schwimmer, JB; Garner, D; Hertel, P; et al. Clinical Gastroenterology and Hepatology. 2023; 21:1261-1270.

Nonalcoholic Fatty Liver Disease in Young Children with Obesity. Klepper, C; Crimmins, NA; Orkin, S; Sun, Q; Fei, L; Xanthakos, S; Mouzaki, M. Childhood Obesity. 2023; 19:179-185.

BMI Metrics Are Poor Predictors of Pediatric Nonalcoholic Fatty Liver Disease Severity. Klepper, CM; Khurana, T; Sun, Q; Fei, L; Crimmins, NA; Siegel, R; Mouzaki, M. Childhood Obesity. 2023; 19:139-143.

Nonalcoholic fatty liver disease risk and histologic severity are associated with genetic polymorphisms in children. Goyal, NP; Rosenthal, SB; Nasamran, C; Behling, CA; Angeles, JE; Fishbein, MH; Harlow, KE; Jain, AK; Molleston, JP; Newton, KP; et al. Hepatology. 2023; 77:197-212.

Clinically Meaningful Body Mass Index Change Impacts Pediatric Nonalcoholic Fatty Liver Disease. Khurana, T; Klepper, C; Fei, L; Sun, Q; Bramlage, K; Arce-Clachar, AC; Xanthakos, S; Mouzaki, M. The Journal of Pediatrics. 2022; 250:61-66.e1.

Nutritional outcomes of patients with pediatric and congenital heart disease requiring ventricular assist devices. Horsley, M; Pathak, S; Morales, D; Lorts, A; Mouzaki, M. Journal of Parenteral and Enteral Nutrition. 2022; 46:1553-1558.

From the Blog

The Importance Of Nutrition To Wound Healing
Blog Healthy Living

The Importance Of Nutrition To Wound Healing

By Marialena Mouzaki, MD, MSc10/15/2021

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