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Sasha High MD FRCPC

Dr. Sasha High is Medical Director of the High Metabolic Clinic. She was born and raised in Ottawa, Canada. She first undertook a Bachelor of Sciences from the University of Ottawa then earned her medical doctorate (MD) and completed an Internal Medicine residency (FRCPC) from the University of Toronto. Dr. High is certified as an American Board of Obesity Medicine diplomate. She has a special interest in nutrition and has taken several courses through the Arizona Center for Integrative Medicine and The Noakes Foundation. She is experienced in treating metabolic diseases rooted in insulin resistance using the low carb high fat (LCHF) diet, ketogenic diet, and intermittent fasting. Dr. High has also undertaken additional mentorship in cognitive behavioural therapy to help patients with sustained lifestyle changes. She has been practicing bariatric medicine since 2013, helping patients manage the disease of obesity and associated conditions. She is passionate about seeing people live their healthiest lives.

Dr. High is a wife and mother of three young children. In her spare time, she enjoys singing, running and kitesurfing with her husband.


Nathalie Ranger MD CCFP (AM)

Dr. Nathalie Ranger is a primary care physician providing psychotherapy to support sustained lifestyle change in treatment of obesity and related metabolic conditions. She completed a Bachelor of Science in Psychology at Western University, and subsequently earned her medical doctorate (MD) at McMaster University. She completed her family medicine residency at Queen’s University, followed by an addiction medicine fellowship in the University of Toronto PGY3 Enhanced Skills program. She is certified by the College of Family Physicians of Canada, with a Certificate of Added Competence in Addiction Medicine (CCFP (AM)). Dr. Ranger is also a staff physician in the Addiction Medicine Service at Homewood Health Centre. 

Following her passion for mental health, goal-oriented behaviour change, and pursuit of a meaningful, healthy lifestyle, Dr. Ranger has expanded her practice to utilize psychotherapeutic techniques to support sustainable lifestyle change. She has gained valuable knowledge through an obesity medicine mentorship experience, and is currently working towards certification by the American Board of Obesity Medicine. 

In her spare time, she enjoys spending time with family and friends, staying active, and experimenting with nutritious baking recipes. 


Asha Patel MD FRCPC

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Francesca Vessio Registered Dietitian

Francesca comes to the High Metabolic Clinic with a wealth of knowledge and experience in obesity medicine. She began her undergraduate education at Western University where she completed a Bachelor of Science in Foods and Nutrition (BScFN), and then went on to pursue higher education at Guelph University, where she completed a combined internship-Master’s degree in Applied Nutrition (MAN).

During her internship training, she had the opportunity of working with the interdisciplinary KidFit team at Credit Valley Hospital, where she provided nutrition counselling and education to families experiencing childhood obesity. This position affirmed Francesca’s vocation in helping those who struggle with their weight, among other conditions they may be dealing with.

She believes that as healthcare professionals, we need to stop pointing our fingers and blaming and instead, start treating obesity as a chronic condition, much like diabetes and hypertension. With obesity being a complex, multi-faceted condition, Francesca provides a highly individualized approach to treating obesity. She works collaboratively with her patients to determine an appropriate intervention that reflects the patient’s nutrition, health, and personal needs.

Francesca provides a welcoming environment and strives to create a positive and meaningful therapeutic relationship with each patient she works with.

Catherine Lin Registered Dietitian

Catherine obtained her Bachelor of Science in Nutritional Sciences in Dietetics from McGill University in Montreal. During her internship training, she had the opportunity to work in various settings including hospitals, long term care centres, and community workshops. She has facilitated grocery tours, cooking workshops and given presentations on different nutrition topics. She specializes in obesity management and has experience counselling patients with metabolic diseases. Catherine works collaboratively with patients to develop a personalized plan for managing obesity and associated conditions. She is passionate about helping patients achieve a healthy and sustainable lifestyle. She is currently a member of the College of Dietitians of Ontario, Dietitians of Canada and a Certified Diabetes Educator.

In her spare time, she enjoys running, hiking, cooking, and learning to dragon boat.  


Sarah Asaad Admin Assistant

Sarah graduated from the University of Toronto with a Bachelor of Science in Psychology. She is currently working on obtaining her Master’s degree in counselling psychology. After earning her Bachelors, she had the opportunity to volunteer at a research lab and be part of a study on gratitude. She learned about why and how people express gratitude, and how this influences relationships.

Sarah finds her role as medical administrative assistant rewarding. She enjoys helping patients with the hope of seeing others achieve happiness and meet their goals. Sarah believes that “There is no exercise better for the heart than reaching down and lifting people up.”― John Holmes

In her free time, Sarah enjoys reading novels and spending time with her family and friends.