Methodology
Every figure published on this site comes from a defined procedure. These pages set out each one: what device or laboratory produced the number, under what conditions it was taken, how often, and what it cannot tell you. Where a measurement is performed professionally, that is stated; where it is a consumer device estimate, that is stated too.
The purpose is simple: anyone reading the dashboard should be able to judge how much weight to put on each number without taking my word for it.
- How the fasting schedule worksThree full fasting days a week for 52 weeks — the rule, and how it is applied.
- How fasting days are selectedWhy the three days are chosen week by week rather than fixed in advance.
- How weight is measuredSame scale, same time, fasted — and why the body-fat number is treated cautiously.
- How ketones are measuredBreath acetone and blood BHB — two different molecules, two different meanings.
- How blood pressure is measuredSame cuff, seated and rested, recorded exactly as displayed.
- How blood tests are conductedAccredited laboratory panels, fasted, with five years of pre-project baselines.
- How DEXA is usedClinical body-composition scans as the reference point between scale readings.
- How VO2 max is measuredA graded exercise test with gas analysis, not a watch estimate.
- How RMR is measuredIndirect calorimetry — and the question of whether metabolism adapts downward.
- How sleep and recovery are trackedWearable sleep, HRV, resting heart rate and recovery — and their limits.
- How observations are recordedHunger, mood, energy and clarity — written the same day, published unedited.
Where the data appears
The readings themselves live on the health dashboard, and the day-by-day account of the project is in the Chronicles. How pages are written and corrected is set out in the editorial policy.
Written by Alfie Hammersham — founder of One Year Fast, who is fasting three full days a week for 52 consecutive weeks and publishing every biomarker openly. Not a doctor; every physiological claim on this site is referenced to published research, and lived experience is labelled as such.
Physiological claims on this page are cited to peer-reviewed studies; first-hand readings come from one subject and are labelled as personal experience. See the editorial & sourcing policy for how this is written, reviewed and corrected.
About the author · Editorial policy · Corrections & contact · Medical disclaimer