Fasting Guidance
Not a diet and not a punishment — a way to give the body a clean, deliberate rest.
6 fasting types
Intermittent to dry.
12–48 hour arc
What to expect, hour by hour.
Break it gently
Fruit and broth before a feast.
Research-backed
What the studies actually show.
What fasting is
Fasting is simply a planned pause from eating. The body, freed from digestion, shifts into repair mode — clearing damaged cells and burning stored fuel. It is one of the oldest practices in human history, and every culture has some version of it.
A calm pause from food is one of the oldest ways we let the body restore itself.
Rest is where repair begins.
What the research says
The studies behind this page, stated plainly, including where the evidence is weaker than the marketing.
In a supervised crossover trial, 8 men with prediabetes who ate all food within a 6-hour early window for 5 weeks improved insulin sensitivity and blood pressure even without losing weight.
Sutton EF, et al. (2018), Cell Metabolism
RCT (8 adults)In 58 adults with obesity over 8 weeks, 4-hour and 6-hour eating windows each produced roughly 3% weight loss and reduced insulin resistance without calorie counting.
Cienfuegos S, et al. (2020), Cell Metabolism
RCT in 58 adultsImportant counterpoint: in 116 adults over 12 weeks, 16:8 time-restricted eating was NOT more effective for weight loss than eating three meals a day.
Lowe DA, et al. (2020), JAMA Internal Medicine
RCT in 116 adultsYoshinori Ohsumi won the 2016 Nobel Prize in Physiology or Medicine for discovering the mechanisms of autophagy, the cell's recycling process. This is the official prize announcement, not a clinical trial.
The Nobel Assembly at Karolinska Institutet (2016), Nobel Prize
Official Nobel (no clinical data)Review concluding that while fasting or calorie restriction can induce autophagy in laboratory models, direct human evidence remains limited and largely indirect.
Bagherniya M, et al. (2018), Ageing Research Reviews
Review (human evidence limited)In 218 non-obese adults over 2 years, about 12% calorie restriction was feasible and improved markers linked to ageing and disease risk, including lower inflammation.
Ravussin E, et al. (2015), Journals of Gerontology Series A
RCT in 218 adults, 2 yearsFasting evidence is mixed: some controlled trials show real benefits and others show no advantage over normal eating. Autophagy research is largely laboratory and animal science, not human trials. Nothing here is medical advice, and fasting is not for everyone.
The types we work with
Intermittent fasting — eating within a set window each day (commonly 16 hours fasted, 8 hours eating). The most practical entry point.
Green juice fasting — a day (or a few) on pressed greens and vegetables. Gentle on digestion, keeps minerals coming in.
Fruit juice fasting — pressed fruit only. Lighter work for the body than solid food, and sweeter on the palate.
Coconut water fasting — the lightest of the liquid fasts; naturally hydrating with electrolytes.
Water fasting — only water. The deepest of the common fasts, and the one most worth supervising.
Dry fasting — no food and no water for a short window. The most intense; we only recommend it under direct supervision.
What to expect, hour by hour
A gentle, honest picture of the common stages — every body moves at its own pace, so read these as a guide, not a promise.
0–12 hours — the body runs on stored sugar, so hunger is usually mild and passes; most people feel close to normal.
12–24 hours — hunger comes in waves that rise and fall; focus often sharpens once the body stops waiting for the next meal.
24–48 hours — the body settles into a deeper rest state; drink plenty of water and keep movement light.
48+ hours — only for the experienced and only with supervision; this is not the place to begin.
Longer fasts change how the body behaves, so anything beyond a day or two is best done with someone experienced watching, and fasting is not for everyone — if your body asks you to stop, the right answer is to eat.
How to break a fast
Come out of a fast the way you went in — gently. Start small and watery: a ripe fruit, a warm broth, or a little fresh juice, and let that settle before anything else. Next, a light cooked meal — soft vegetables or a small bowl of something warm and simple. A normal meal can follow a little later, once the body has remembered how to eat. Hold back on making the first thing large and heavy; after hours of rest, digestion needs a soft re-entry, not a feast.
Known benefits
- •Autophagy — the body's cellular clean-up, where damaged cells are broken down and recycled.
- •Insulin sensitivity — fasting gives insulin a break and can help the body respond to it better.
- •Cellular repair — fasting research has looked at how the body recycles damaged cell parts, but most of that evidence comes from laboratory and animal studies rather than human trials.
- •Mental clarity — many people describe a steady, clear focus once the body adjusts.
- •A reset of appetite — a fasting window often re-tunes how hunger and fullness are felt.
Who should be careful
Fasting is not for everyone. Pregnant or nursing women, growing children, anyone underweight, or anyone with a history of disordered eating, diabetes, or other medical conditions should not fast without professional guidance. When in doubt, we tell people to eat.
Fasting Guide
Instant PDF download
A clear written guide to every type above — how to prepare, what to expect hour by hour, how to break the fast safely, and how to choose the right one for your goals.
Want to fast with supervision?
A 60-minute consultation to plan a fast around your history, your health, and your pace — including water and dry fasts, which we only ever do supervised.