About
Dr. Ari Katz spent five years as a hospitalist at Northwestern, managing 15 to 20 complex and critically ill patients each day in a multidisciplinary setting. That experience sharpened his diagnostic instincts and deepened his conviction that earlier intervention changes outcomes. He noticed that many hospitalized patients could have avoided serious illness with proactive preventive care years before their crisis. That insight drew him toward longitudinal, relationship-based medicine.
0" philosophy. He is passionate about the gut-brain connection, microbiome health, nutrition, and the role of physical activity in long-term wellness. He relocated to the Bay Area with his wife and three sons to be closer to extended family and pursue outdoor activities including hiking, biking, and camping.
Education & Training
Additional Training
Five years as a hospitalist at Northwestern managing complex and critically ill patients
Conditions Treated
Who is Dr. Katz right for?
Dr. Katz is a strong fit for adults who want proactive, prevention-focused primary care. Patients with complex or hard-to-diagnose conditions benefit from his hospitalist-trained diagnostic skills. He works well with people motivated to optimize their health through nutrition, gut health, and physical activity. Those interested in the Outperform philosophy and performance-driven wellness will find his approach a natural match.
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Frequently Asked Questions
Dr. Katz focuses on internal medicine and preventive medicine. His clinical interests include gut-brain health, microbiome function, nutrition, and physical activity. He brings a strong preventive lens to primary care, emphasizing early intervention before serious illness develops.
Dr. Katz spent five years as a hospitalist at Northwestern. He managed 15 to 20 complex and critically ill patients each day in a multidisciplinary setting. That experience built his diagnostic instincts and deepened his focus on prevention.
During his hospitalist years, Dr. Katz noticed that many patients could have avoided hospitalization with earlier preventive care. That insight drew him toward longitudinal, relationship-based medicine. He wanted to intervene earlier and follow patients over time.
Yes. Dr. Katz is passionate about the gut-brain connection, microbiome health, and nutrition. He integrates these interests directly into his clinical approach. Patients focused on lifestyle-driven health optimization are a natural fit for his panel.
Dr. Katz believes earlier intervention changes outcomes. He draws on his hospitalist training to identify risk factors before they escalate. His approach combines advanced diagnostics with personalized lifestyle guidance around nutrition and physical activity.
Dr. Katz caps his panel at 250 patients. That limit allows him to provide meaningful access and longer visits to each member.
Doctor profile last updated March 21, 2026