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Our Bariatric Team
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800 S. Washington Ave.
Saginaw, MI 48601
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Our Team Approach

Program Introduction

Our Bariatric Team

Beyond Surgery

We recognize that achieving positive, long-term outcomes requires comprehensive support beyond surgery. We offer:

  • Full-time registered nurse, bariatric surgery program leader and bariatric surgery medical director
  • Gastroenterologists for complete gastrointestinal care
  • Psychiatrists and psychotherapists for emotional care
  • Physical rehabilitation for mobility improvement
  • Sleep disorder specialists for better quality, device-free sleep
  • Nutritionists trained in bariatric issues
  • Cardiologists, pulmonologists, neurologists and other specialists as needed
  • Comprehensive weight management guidance
  • Partnership with Touchpoint to help patients learn healthy cooking tips
  • Bariatric support group
  • Ongoing seminars and fitness classes



Our Bariatric Team

Bariatric Surgeon

Vasanth Stalin, MD 
Assistant Professor of Surgery, Central Michigan University
Residency, Albert Einstein College of Medicine, Montefiore Medical Center, NYC
Fellowship, Advanced Laparoscopic & Bariatric Surgery, Cleveland Clinic
Board Certified in Obesity Medicine and General Surgery
Member of the American Society for Metabolic & Bariatric SurgeryMember of the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES)
Robotic Console surgeon and the recipient of multiple awards from the Albert Einstein College of Medicine

Surgery Director

Cheryl VanOoteghem, RN
Director of Surgical Services at St. Mary’s of Michigan, Cheryl VanOoteghem, was hired at St. Mary’s of Michigan in May of 1987 and has been the Director of the Surgical Services since 1999. Through her 27 years of service at St. Mary’s of Michigan, Cheryl has been providing a vast array of surgical service expertise. Cheryl acquired her BSN in 1988. She obtained her BLS certification in 1985 and her DIM certification in 1987 and has maintained both certifications since this time. 

Cheryl is a key member of the St. Mary’s of Michigan family and holds her staff to an extremely high level of standards.  

Bariatric Center Manager, Certified Bariatric Coach

Lisa Guyton
Bariatric Center Manager at St. Mary’s of Michigan.  Lisa received her certification as a Bariatric Support Group Leader and Back on Track Facilitator in 2010 with Bariatric Support Centers International.  She received her certification as a Bariatric Coach in February of 2014.

Lisa is also a bariatric patient and has been through the process.  She understands the steps toward a healthier you and will be there to guide and support you on your journey.

Bariatric Nutrition Expert

Megan Hammis, Registered Dietitian 
Megan is a registered dietitian nutritionist.  She received her Bachelor of Science in Dietetics from Central Michigan University and completed her dietetic internship at Henry Ford Health System in Detroit, MI.  She started her career as an outpatient dietitian working in an eating disorder and substance abuse clinic, then continued on to work at long term care and sub-acute rehab facilities in the metro-Detroit area and in Saginaw.   

Megan is passionate about health, nutrition, food and helping people. She loves teaching and seeing the "lightbulb” turn on for her clients when they learn something new about nutrition. She embraces each client's individuality and will help them implement the best plan to achieve their personal goals, focusing on what motivates them and encouraging them during their entire journey. She will be an active part of your bariatric support team every step of the way!

Exercise Physiologist

Jason Weigle
Bachelors of Science – CMU Health Fitness in Preventive and Rehabilitative Programs
Master of Science – Oakland U.  Exercise Science 
Worked in Cardiac Rehabilitation from 1994-Present 
Company Leader for AHA Heart Walk Director of Upward Basketball, a Christian youth basketball program Advanced Cardiac Life Support Certified

800 South Washington Avenue | Saginaw, MI 48601 |
(989) 907-8000 | 1-844-907-8000
` © 2016 AHIS / St. Mary's of Michigan