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nutrition & endurance Expert
Guidance from Nancy Clark.Every day.
Board-certified sports dietitian who has counseled everyone from casual exercisers to Olympians for 40+ years; her Sports Nutrition Guidebook has sold over 800,000 copies.
Nancy Clark
Sports Nutritionist & Registered Dietitian (MS, RD, CSSD)
Nancy Clark, MS, RD, CSSD, is an internationally known sports nutritionist and registered dietitian who has specialized in sports dietetics for over 40 years. She earned her undergraduate degree in nutrition from Simmons College in Boston and a graduate degree in nutrition (with an exercise physiology focus) from Boston University, and completed her dietetic internship at Massachusetts General Hospital. From her private practice in Newton Highlands, Massachusetts, she counsels fitness exercisers and competitive athletes — from high schoolers to collegiate, elite, and Olympic athletes — and has worked with members of the Boston Red Sox, Celtics, and Bruins. She is a Fellow of both the Academy of Nutrition and Dietetics and the American College of Sports Medicine. Her work focuses on nutrition for performance and health and the nutritional management of disordered eating, and her best-selling Sports Nutrition Guidebook has sold more than 800,000 copies.
Sports Nutritionist & Registered Dietitian (MS, RD, CSSD)Nancy Clark
Areas of expertisenutrition, endurance, running
2 published booksNancy Clark's Food Guide for Marathoners: Tips for Everyday Champions, Nancy Clark's Sports Nutrition Guidebook (5th Edition)
2 works in the Ottavia corpusApplied to your guidance with attribution
over2publications
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How Ottavia and Nancy Clark work for you
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Every recommendation combines your health data with the expertise you trust.
Everything included with your subscription
The full Ottavia app, with Nancy Clark's knowledge applied to every report, question and log.
Reports that explain, not just summarize.
Sleep, recovery, workouts, weight, blood pressure, and more. Each report connects your health data, habits, and personal context to uncover what matters most. Instead of overwhelming you with numbers, Ottavia highlights the patterns, explains why they matter, and helps you make better decisions.
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Health isn't built in a day. It's built through years of small decisions, changing bodies, and evolving needs.
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How does it work?
Connect your wearable or log your sleep, meals and workouts. Each morning Ottavia reads your night and your day, applies Nancy Clark's methods where they fit, and gives you one clear plan. Ask anything during the day; the answers use your own data.
What do I get with Nancy Clark's subscription?
Nancy Clark's published method, applied by Ottavia to your own sleep, training and meals every day. You see where that work shaped a message, every time.
Why can't I get this from ChatGPT?
ChatGPT answers from general knowledge and forgets you between questions. Ottavia reasons from your actual data, every day, and applies a named expert's published method with attribution. It is not advice in general; it is about your own Tuesday.
Is this medical advice?
No. Nancy Clark guides and educates through Ottavia, and never diagnoses or prescribes.
Do I talk to Nancy Clark directly?
No. Ottavia has read Nancy Clark's published work and applies it inside your guidance. Your questions go to Ottavia; that thinking comes back in the answer, attributed.
What happens to my health data?
Your data stays in your Ottavia account and is used only to guide you. The third-party AI services Ottavia uses never learn who you are: they see the health context needed to answer you, never your name or contact details. Your data is never sold, never used to train AI models, and is deleted from those services when you delete your account.
Does Nancy Clark see my data?
No. Experts contribute their methods to Ottavia; they never see individual users or their data.
Do I need a wearable?
Ottavia works best with Apple Watch, Garmin or Google Health. You can also log sleep, meals and workouts yourself.
What does it cost, and can I cancel?
The price is shown clearly before you subscribe. Manage or cancel anytime in the Experts hub; you keep access until the end of the period you paid for.