The hormesis literature is unusually fragmented. Unlike sleep or nutrition, there is no single book or single voice that covers all the practices in this pillar at the depth and editorial register we’d want to point members toward. The resources below cover the practices individually, often by the researchers doing the primary work, and members are encouraged to draw from multiple voices rather than anchoring to any one.
Winter Swimming: The Nordic Way Towards a Healthier and Happier Life — Dr Susanna Søberg
The best single book on cold exposure from a working researcher. Søberg is the metabolic scientist whose 2021 Cell Reports Medicine paper produced one of the most-cited recent demonstrations of how regular cold exposure changes brown fat behaviour and cold-induced thermogenesis in humans. Her book is part cultural exploration of Scandinavian winter swimming, part practical guide, and part accessible synthesis of the science she and her colleagues have been building.
What Doesn’t Kill Us — Scott Carney
Carney’s 2017 book is the earliest and most accessible popular treatment of cold exposure and the Wim Hof Method, a New York Times bestseller. It’s both an engaging narrative about Carney’s own experiments with cold and breathwork and a readable introduction to the underlying biology, including brown fat. Honest flag for members: Carney’s own arc in the book is from journalistic skeptic to ‘true believer’ in the Wim Hof Method. The book is closer to a conversion narrative than neutral journalism, and members reading it should know that. Within those limits, it’s genuinely entertaining and remains one of the more accessible entry points to the practice.
Lifespan — David Sinclair
Sinclair’s 2019 book is the most-cited popular treatment of the cellular biology of ageing, and it covers the mechanisms behind hormetic practices — sirtuins, NAD, autophagy — clearly and accessibly. Honest flag: Sinclair has commercial interests in some of the supplements the book discusses, and the book pitches several supplement claims more confidently than the evidence at the time of publication supported. The mechanistic chapters are the good part; the supplement recommendations should be read alongside more sceptical sources.
‘Cardiovascular and Other Health Benefits of Sauna Bathing’ — Laukkanen, Laukkanen & Kunutsor (Mayo Clinic Proceedings, 2018)
The best single peer-reviewed synthesis of the sauna evidence. Open access, written for a clinical audience but accessible to interested non-specialists.
‘Effects of Intermittent Fasting on Health, Aging, and Disease’ — de Cabo & Mattson (New England Journal of Medicine, 2019)
The canonical mechanistic synthesis of intermittent fasting in a top-tier general medical journal. Covers the metabolic switch, the cellular stress responses, and the human evidence at the level of detail a clinically curious reader can follow.
‘A Critical Assessment of Fasting to Promote Metabolic Health and Longevity’ — Fazeli & Steinhauser (Endocrine Reviews, 2025)
The most useful counterweight to the more enthusiastic fasting literature. Argues that most apparent human fasting benefits are attributable to weight loss and that bone density loss is a meaningful underdiscussed risk. Members enthusiastic about fasting should read this alongside more positive synthesis.
‘Effects of Cold-Water Immersion on Health and Wellbeing’ — Cain et al. (PLOS ONE, 2025)
The most comprehensive recent meta-analysis of cold-water immersion. Open access. Members hearing strong claims for cold exposure should read this for the more measured picture the actual evidence supports.
Huberman Lab — ‘Dr. Susanna Søberg: How to Use Cold & Heat Exposure to Improve Your Health’ (15 May 2023)
The most substantive long-form treatment of cold and heat science available in podcast form. Søberg as the expert guest walks through the biology, the minimum-dose thresholds her research has helped establish (around 11 minutes of cold per week, around 57 minutes of sauna per week as useful starting points), the ‘end on cold’ principle, and the differences between cold showers and full immersion. Around two hours, appropriate for members willing to invest in depth.
ZOE Science & Nutrition — ‘The TRUTH About Intermittent Fasting’ with Tim Spector and Gin Stephens (11 April 2024)
The best single podcast episode on intermittent fasting. Covers the findings from ZOE’s Big IF Study — over 100,000 participants, genuinely the world’s largest intermittent fasting study — alongside practical guidance on getting started. An hour long, with useful practical material for members weighing whether to try a time-restricted eating approach.
Found My Fitness — ‘Dr. Jari Laukkanen on Sauna Use for the Prevention of Cardiovascular & Alzheimer’s Disease’
Rhonda Patrick interviews Laukkanen himself — the Finnish cardiologist who led the Kuopio sauna studies referenced throughout this pillar. Members who want to hear the primary researcher walk through his own findings, covering dose-response, mechanisms, and the practical questions that follow, will find this the most useful sauna episode available.
Outdoor Swimming Society
The Outdoor Swimming Society (outdoorswimmingsociety.com) is the best UK resource for members interested in cool and cold-water swimming as a sustainable practice. Covers safety, group swims, recommended locations across the country, and seasonal guidance.
Local lidos and outdoor pools
The UK has an unusually good network of outdoor swimming infrastructure. Most major cities have at least one lido or open-air pool. Tooting Bec Lido and Hampstead Heath Ponds in London, Clevedon Marine Lake near Bristol, Jesus Green Lido in Cambridge, and the Cornish tidal pools (Bude Sea Pool, the Jubilee Pool in Penzance) are among the best-known examples. For many members, a local lido is the most sustainable entry point into cold-water practice.
Sauna access through gyms and leisure centres
Most council leisure centres and many private gyms in the UK now have at least basic sauna facilities. For members starting out, this is by far the most cost-effective access route. Quality varies; traditional dry saunas heated to 80°C or above are what the Finnish cohort evidence is based on, so it’s worth checking before committing.
