Meet our team

Ria Thakur


Ria Thakur is our in-house dietitian, passionate about all things food and nutrition. She chose to become a dietitian because she realized that so many of our health conditions can be prevented or reversed through proper nourishment. With obesity on the rise, and her love for healthy meals and helping people, she decided to study nutrition and understand the science behind food and how it affects our body. She completed her undergraduate degree at the University of Illinois in Urbana-Champaign and went on to complete a rigorous dietetic internship at UChicago Medicine Ingalls Memorial Hospital. 

Ria is the go-to person for our patients to ask any nutrition-related questions. She is constantly educating our patients so that they too, understand the science behind their food choices. She is very mindful about the origin of her own food and encourages patients to eat whole foods that come from the ground versus those processed in a factory. She helps our patients become mindful about their own food choices so they can live their best life. When patients meet with Ria, they are greeted with energy and positivity to help them achieve their goals. Besides helping our patients on their weight loss journey, you can find her cooking up a new healthy recipe in the kitchen or leading our next grocery store tour. 

Joellen Litwinko


Joellen brings her upbeat, shining personality to Whole Health Weight Loss Institute. She epitomizes customer service with her positive outlook and friendly attitude. With her clinical expertise and training, she can effectively guide patients to make informed decisions. As part of a multidisciplinary team, Joellen’s unending positivity and authentic care makes everyone feel at ease and welcome. Joellen gets the highest marks in patient satisfaction. 

Kristina Williams

Office Assistant

Kristina brings broad experience, not only in HR but also Business Development and Management.  Her friendly demeanor lends itself to putting those who work with her at ease.

Summer Summers

Practice Administrator

Bio coming soon…

Napa, CA Office

1300 Main St #200
Napa, CA 94559

napa weight loss office