Who is Chelsia Andreassen?
Chelsia Andreassen is a Seattle-based functional medicine nutrition practitioner and the founder of Bio Harmony Nutrition & Functional Medicine. In 2026, she was recognized as a Puget Sound Business Journal 40 Under 40 honoree for her leadership in healthcare marketing, strategic communications, and prevention-based medicine.
Her path into clinical nutrition was not linear. Before entering the field, Chelsia built nearly two decades of leadership experience across technology, senior housing, and healthcare with a focus on marketing strategy, digital growth, and organizational positioning. She served as Senior Director of Marketing for Leisure Care, a multi-location senior housing organization, where she oversaw marketing, communications, and portfolio-wide growth initiatives across nearly 60 communities.
During the COVID-19 pandemic, one of the most disruptive periods in senior housing history, she led high-stakes communications and strategic response in an environment defined by fear, rapidly evolving policy, and intense public scrutiny. That experience sharpened her systems-level view of healthcare and revealed a deeper structural issue: while organizations worked tirelessly to respond to illness, far less attention was paid to the upstream drivers of resilience, including metabolic health, nutrition quality, environmental exposures, and social connection. Prevention was often secondary in a system designed primarily to react.
The Catalyst for Change
At the same time, Chelsia was navigating her own complex health journey. She experienced persistent, broad symptoms that were not fully explained through conventional care. Over time, deeper investigation uncovered underlying factors, including environmental exposures, which required a comprehensive and individualized approach to recovery.
Chelsia returned to school to formally study nutrition at Bastyr University, earning a Bachelor of Science in Nutrition, graduating with honors, and delivering her commencement address. She is currently completing a Master of Science in Human Nutrition & Functional Medicine (June 2026) and pursuing a Certified Nutrition Specialist (CNS) credential.
Today, through Bio Harmony, she applies the same systems thinking that defined her executive career to individualized patient care, helping clients identify root contributors to chronic symptoms and build long-term resilience with an emphasis on improving healthspan, not just managing disease.
Chelsia also trains clinically at New Frontiers Clinic under the mentorship of Dr. Kara Fitzgerald, ND, a leader in functional medicine and research on epigenetics and lifestyle-based interventions for healthy aging. In this setting, she applies advanced clinical nutrition, laboratory interpretation, and personalized care strategies within a collaborative patient care model.
Professional Focus
Chelsia Andreassen’s clinical interests center on complex chronic symptoms that often involve multiple body systems rather than a single diagnosis. Her work frequently involves evaluating patterns related to digestion, metabolism, and environmental exposures and understanding how they interact.
Rather than focusing only on disease labels, her approach emphasizes physiology, identifying factors that may be contributing to persistent symptoms and supporting the body’s regulatory systems through nutrition and lifestyle interventions.
Her clinical perspective is informed by both academic training and supervised patient care in a functional medicine setting.
Approach to Care
Chelsia’s clinical approach reflects a systems-based model of health. Functional medicine evaluates how different physiological systems interact, rather than viewing symptoms as isolated events.
Her work emphasizes
- Individualized care plans
- Nutrition as a therapeutic tool
- Lifestyle and environmental contributors to health
- Long-term health resilience
- Nutrition is used as a primary intervention, but recommendations may also address sleep, circadian rhythm, stress physiology, and environmental factors when relevant.
The goal is to help individuals better understand their own physiology and make sustainable changes over time.
Education and Clinical Training
- Clinical training at New Frontiers Clinic under mentorship in functional medicine and epigenetic-focused care
- Certified Nutrition Specialist (CNS) candidate
- Master of Science in Human Nutrition & Functional Medicine (expected June 2026) — University of Western States
- Bachelor of Science in Nutrition & Culinary Arts — Bastyr University (Honors) 2023
