Fasting Can Save Your Life

Herbert M. Shelton (1895–1985) was the most prolific and influential figure of the Natural Hygiene movement. Over 45 years he supervised more than 40,000 fasts at his San Antonio institution. Fasting Can Save Your Life is his most accessible work — a layman's guide that distills his clinical experience and philosophical framework into a book that is simultaneously a polemic against medical orthodoxy, a physiological textbook, and a clinical manual covering fasting in dozens of specific disease conditions.

Shelton's central argument is that fasting is not a therapy, cure, or treatment — it is a period of physiological rest during which the body's own self-healing powers operate at maximum efficiency. Disease arises from toxic overload and enervation; when food is withheld, the body's energy, previously consumed by digestion, is redirected toward elimination and repair. This is not a metaphor — Shelton documents the biochemistry of autolysis (the body's enzymatic self-digestion of stored and diseased tissues), the hierarchy in which the body burns reserves (fat first, then less vital tissues, vital organs last), and the sharp distinction between fasting (drawing on reserves) and starvation (reserves exhausted). Fasting properly ended before starvation is safe; starvation is when harm begins.

The book covers weight loss, the physiology of living without food, the distinction between true hunger and false appetite, four reasons for fasting (weight reduction, physiological compensation, rest, elimination), practical fasting protocols, and 20+ specific disease conditions ranging from the common cold to MS, asthma, arthritis, high blood pressure, gallstones, psoriasis, and cancer. The foreword by Alec Burton (Director, Arcadia Health Centre, Sydney) provides historical context on Shelton's life and the Natural Hygiene tradition. The 2023 edition is published by the National Health Association (formerly the American Natural Hygiene Society).

The book is a foundational text for anyone interested in therapeutic fasting, water fasting, or the Natural Hygiene philosophy. It should be read alongside modern supervised fasting research (TrueNorth Health Center, Valter Longo's work) for updated protocols, but Shelton's clinical observations remain remarkably consistent with modern findings.

1. Never fast unsupervised beyond 3 days: Shelton is unequivocal — find a practitioner trained in therapeutic fasting supervision (IAPNH members, TrueNorth Health Center, equivalent institutions). 2. Water only: The true fast is water-only. Juice fasts, broth fasts, herbal teas during fasting are not the same and produce different (lesser) results. Coffee, tea, vitamins during fasting corrupt the experiment. 3. Rest completely: Bed rest or near-bed rest. Minimize physical and emotional activity. No visitors who disturb you. No news. No tests beyond what's necessary. Poise is as important as physical rest. 4. Do not eat when acutely ill: If appetite is absent during fever, infection, or acute illness — respect it. Withhold food until hunger genuinely returns (sweet breath, clean tongue, genuine desire for plain food). 5. Do not force-feed sick children: Loss of appetite in a sick child is protective. Offer water; wait for genuine hunger to return. 6. True hunger signals: When the fast should end — not by calendar but by signs: clean pink tongue, sweet breath, genuine desire for plain food, and the return of true hunger (pleasant sensation in mouth/nose/throat, not stomach gnawing). 7. Breaking the fast is critical: For a fast of more than a few days, reintroduce food very gradually. Start with small amounts of diluted juice (orange, grapefruit), then whole fruit, then expand over several days. Never break with solid food immediately. 8. 3 short fasts per year: Oswald's protocol for health maintenance — three 1–3 day fasts per year will "purify the blood and eradicate the poison-diathesis more effectively than a hundred bottles of expurgative bitters." 9. After the fast: change the habits: The fast removes accumulated toxemia; eating and living habits determine whether it returns. A fast followed by a return to the old diet produces a return of the old condition. 10. No enemas during fasting: Colonic irrigation during fasting is unnecessary and potentially harmful. The bowel is resting; leave it alone. 11. No supplements, vitamins, or drugs during fasting: These contaminate the fast and produce harm falsely attributed to fasting. Water only. 12. Warmth is essential: Metabolic rate drops during fasting; the faster feels cold more easily. Keep warm at all times — this conserves energy for healing rather than heat production.