Fasting and wilderness

Fasting retreat

also known as Water-only fasting, therapeutic fasting

High intensity$$$5 to 40 days, medically supervised

Extended fasting under medical supervision, from a modified low-calorie protocol through to water only. By day three or four most people report a marked change in mental state: flat, clear, and oddly unbothered. It is also the practice on this page with the most serious physiological consequences if done badly.

Two traditions, and they are not the same. The European clinical model uses a very low calorie intake with broth and juice, keeps you walking and treated daily, and has a century of institutional practice behind it. The North American model at TrueNorth is water only, in bed, with daily physician monitoring and blood work.

The altered state is real and under-discussed. Prolonged fasting shifts cognition and mood in a way people frequently describe as a lifting, and religious traditions from Ramadan to Lent to the wilderness fast have organised around exactly that. It arrives without anything ingested and without a facilitator.

Do not improvise this. The dangerous part is not the fast, it is the refeeding, and the people most likely to be harmed are the ones who did it alone after reading about it.

The shape of it

What happens

Days 1 to 2Hunger, headache, irritability. Caffeine withdrawal makes this considerably worse for most people.
Days 3 to 4Hunger largely stops. Ketosis established. Energy low, mind commonly reported as clear and flat.
Days 5 onwardStable but weak. Daily monitoring of blood pressure, electrolytes and heart rhythm at any competent facility.
RefeedingRoughly half the length of the fast, supervised. This is the phase that kills people who do it alone.

A representative shape drawn from how these are typically run. Use it as something to ask against, not as any one centre's timetable.

Before you book

What to check

Whether a physician sees you daily and whether blood work is actually run.
What their protocol is for stopping a fast early, and who decides.
How they handle your existing prescriptions. Blood-pressure and diabetes medication in particular become dangerous at the same dose while fasting.
Whether the refeeding period is included in the price or sold separately.

Not for

Pregnancy or breastfeeding
Type 1 diabetes, eating disorders, or a low starting body weight
Anyone on medication who has not had the dose reviewed by the supervising physician
Anyone attempting it without medical supervision

Origin

Present in most religious traditions; the modern clinical form is European and North American

Where to do it

2 places that run this

Chosen for institutional standing rather than atmosphere: a named founder, a registered charity or non-profit, a published lineage, decades of operation, a price you can read before you enquire. We have inspected none of them, and each entry says what its standing actually rests on.

TrueNorth Health Center

1984

Santa Rosa, California, USA

The largest facility in the world specialising in medically supervised water-only fasting, founded by Alan Goldhamer and Jennifer Marano, with more than 25,000 patients supervised and an affiliated research foundation publishing outcomes. Water only, in bed, physician-monitored.

Format: Typically 5 to 40 days plus refeeding
Cost: Daily rate covering room, monitoring and physician care

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Buchinger Wilhelmi

Method from 1920; the clinics family-run for four generations

Überlingen, Germany; Marbella, Spain; Roquefort-les-Pins, France

The European clinical tradition: modified fasting on broth and juice rather than water only, with medical treatment, movement and therapy alongside. Runs its own research programme and publishes on large patient cohorts. Substantially more comfortable, and substantially more expensive, than the water-only model.

Format: One to four weeks
Cost: Clinic rates, expensive, sometimes partly insured in Germany

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No centre has paid to appear here and no link on this page earns us anything. If that ever changes it will be disclosed on the listing itself, not in a footer.

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If a substance is what you're after

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