Water Fasting Coach for Deep Healing and Long-Term Health

Portrait of Dr. Tallis Barker, international water fasting coach and Oxford-educated naturopath, author of waterfasting.org

Dr. Tallis Barker (D.Phil., Nat.Dip., NA.Dip.) is an internationally recognized water fasting coach, naturopath, nutrition advisor, and educator, guiding clients worldwide in safe, transformative fasting. With over 15 years of personal fasting experience and more than 1000 clients supported across five continents, he specializes in long-duration fasts (3–40 days) for deep cellular repair, chronic illness recovery, and full metabolic reset.

His approach is grounded in both science and lived experience. He combines a doctorate from Oxford with naturopathic training from the School of Health (UK), offering guidance that is rigorous, intuitive, and rooted in direct practice. His clients include medical professionals, health seekers, and those who have exhausted conventional treatment paths.

Fasting Expertise

  • Specialist in extended fasts (21–40 days) for therapeutic benefit
  • Experience guiding fasts with a focus on digestive issues, autoimmune conditions, inflammation, fibroids, hormonal imbalances, and more
  • Regularly incorporates intermittent dry fasting for advanced cellular healing
  • Speaker at global events such as The Real Truth About Health
  • Instructor at the School of Health (UK), training future naturopaths
  • Creator of a comprehensive fasting knowledge base at waterfasting.org

Academic Background

Tallis originally studied musicology at Harvard University (B.A. magna cum laude) and earned his doctorate (D.Phil.) at Oxford University, where he later lectured. After a life-changing personal transformation, he retrained in naturopathy (Nat.Dip.), and as a Nutrition Advisor (NA.Dip.) under Mary Sharma ND, completing his clinical training in the UK.

This dual perspective—scientific and spiritual, academic and embodied—is central to his unique approach to fasting.

Living the Practice

Tallis doesn’t just teach fasting—he lives it. He fasts regularly (often one month per year) and documents his experiences through journals and videos. Two of his resources on this topic:

Both offer rare, first-person insights into the physical, emotional, and spiritual dimensions of extended fasting.

Beyond Fasting

Tallis is also a classical pianist, meditation teacher, and long-distance trail runner. He explores the connection between fasting and endurance, not only through metabolism (ketosis) but through the psychological disciplines of strength, surrender, and presence.

He has recorded multiple piano albums (available on Spotify and iTunes) and is the author of Growing into Being.

He lives in the UK with his wife and three grown children.

Fasting Guides & Plans

Looking for practical resources? Visit the Waterfasting.org or its Webshop to explore downloadable guides and structured fasting plans designed to help you succeed—safely, mindfully, and deeply.