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Bring together your wearables, health apps, meals, symptoms, and daily habits.
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
Expert knowledge, applied to your day.
Your wearable data, habits, and goals come together with expert knowledge to deliver personalized guidance.
How Ottavia and Nancy Clark work for you
Understand your body.
Ottavia recognizes patterns across your sleep, recovery, activity, nutrition, and lifestyle.
Know what to do next.
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.
Daily Reports
Start every day with clarity.
Ask Anything
Expert guidance for every decision.
Food Guidance
Know what to eat and why.
Adaptive Plans
Plans that evolve with you.
Smart Nudges
Helpful guidance at the right moment.
Your health tools, connected.
Enjoy connecting your favourite wearables, devices and apps to discover health patterns
COMING SOONThe future of personalized health
Health isn't built in a day. It's built through years of small decisions, changing bodies, and evolving needs.
Built to grow with you.
Every day adds another piece to your health story. Over time, Ottavia connects your wearables, biomarkers, blood tests, symptoms, habits, and life events to uncover patterns unique to you.
Built by woman for woman
Women's health isn't a niche. From menstrual health and pregnancy to perimenopause and healthy aging, Ottavia is built to understand the biological changes that shape women's lives.
Your personal board of experts
No single expert has every answer. Build a trusted team of experts that grows with you, bringing together different perspectives for every stage of your life.
Start with Nancy Clark today.
Free
Educational, not medical advice. Subscription happens in the Ottavia app.
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?
Their published methods and research, applied by Ottavia to your own sleep, training and meals every day. You see where their 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 Tuesday night.
Is this medical advice?
No. Nancy Clark guides and educates through Ottavia. They never diagnose or prescribe.
Do I talk to Nancy Clark directly?
No. Ottavia has read their published work and applies it inside your guidance. Your questions go to Ottavia; their 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. AI runs on anonymized context, separated from your identity; your personal and health data is never shared with any AI provider, and never sold.
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.