Buchinger Wilhelmi vs Chenot Palace: Medical Fasting or Seven-Night Detox Program?

Buchinger Wilhelmi and Chenot Palace Weggis both use substantial calorie restriction inside medically supervised residential programs. They are not the same intervention.

Buchinger’s core model is therapeutic periodic fasting with small amounts of juice and broth, clinical monitoring, movement, rest, and structured refeeding. Chenot’s Advanced Detox program publishes an 850-kcal-per-day, plant-based “fast with food” approach alongside consultations, diagnostics, and body treatments.¹²

Neither program has been shown to extend human lifespan. The word “detox” does not identify a toxin, validated removal endpoint, or proven long-term outcome by itself.

Review note, August 28, 2026: WLC removed scores, winners, unsupported clinic statistics, ratings, price ranges, and the claim that Chenot has no published evidence. We now distinguish evidence for Buchinger-style fasting from evidence for either complete commercial package, and we disclose the main limitations and conflicts in the largest Buchinger cohort.

Current program comparison

Decision factor	Buchinger Wilhelmi	Chenot Palace Weggis Advanced Detox
Core nutrition model	Periodic fasting with approximately 200 to 250 kcal/day in the published cohort	Three plant-based meals totaling 850 kcal/day
Public duration	Compact from 10 nights, Classic Light from 14, Classic from 21, Classic Royal 28; shorter non-fasting options also listed	Seven-night minimum
Medical supervision	Consultations, laboratory work, daily nurse checks, and 24-hour care listed in package terms	Two medical consultations and tailored program supervision listed
Public program price	Current package page links services and price information, but WLC could not extract a reliable total	CHF 5,500 program fee
Accommodation	Included in Buchinger package descriptions	Confirm separately in the Chenot quote
Main evidence	Prospective observational fasting cohort, not randomized	Provider description of branded program components
Main safety issue	Prolonged very-low-calorie fasting and medication adjustment	Calorie restriction plus multiple diagnostics and treatments

The CHF 5,500 Chenot number should not be compared with an old guessed Buchinger range. Request full totals for the same seven- or ten-night period, including room, occupancy, medical work, treatments, taxes, and follow-up.

Buchinger Wilhelmi’s program

Buchinger Wilhelmi currently presents clinics at Lake Constance, Marbella, and Côte d’Azur. Its Lake Constance package page lists medical care, two physician consultations per seven nights, laboratory checks, daily nurse monitoring, liver packs, periodic intestinal cleansing, round-the-clock care, accommodation, fasting provisions, exercise, facility access, and a daily therapy voucher.³

The main fasting packages begin at ten nights and extend to 28 nights. A seven-night Time Out and a three-night Relax option are also listed, but these should not be assumed to reproduce the fasting protocol studied in the research cohort.³

The exact program, fasting days, refeeding days, room, and clinical additions need to appear in the quote.

Chenot’s Advanced Detox program

Chenot Palace Weggis publishes a seven-night minimum and a CHF 5,500 Advanced Detox program fee. The provider describes:²

• 850 kcal per day across three plant-based meals;
• two medical consultations;
• two nutrition consultations;
• four proprietary lifestyle biomarkers;
• body-composition and other assessments;
• hydro-aromatherapy, phyto-mud, hydro-jet, massage, and additional treatments;
• 36 diagnostics and treatments in total.

The page claims that the program resets energy metabolism, repairs defective tissue, restores hormonal balance, removes toxins, promotes spontaneous cell regeneration, and supports health for years.² These are provider claims. The page does not provide a controlled trial showing that the complete seven-night package produces those long-term outcomes.

Ask whether CHF 5,500 includes accommodation, meals, taxes, all listed diagnostics, and every treatment session. The public page presents accommodations separately, so the total trip price should be confirmed rather than inferred.

What the 1,422-person Buchinger study found

The 2019 PLOS ONE study prospectively observed 1,422 adults who completed four to 21 days of Buchinger fasting in the Lake Constance clinic. The protocol provided approximately 200 to 250 kcal per day, hydration, light-to-moderate activity, daily monitoring, and structured refeeding.¹

Researchers reported short-term reductions in weight, waist circumference, blood pressure, blood glucose, and several lipid measures. Participants also self-reported wellbeing and health-complaint changes. Adverse events were reported in 0.7% of participants, and two people required hospital admission during the study period.¹

This supports the feasibility of a medically supervised protocol in selected participants. It does not prove long-term disease prevention, lifespan extension, or superiority over another clinic.

The study’s limitations matter

The paper identifies several limits:¹

• it was an observational cohort without randomization or a control group;
• participants voluntarily selected the clinic and fasting duration;
• 1,422 participants were selected from 3,929 admitted people under protocol criteria;
• findings were specific to one specialized clinic and may not apply to unsupervised fasting;
• clinic staff performed unblinded data collection and entry;
• the study was funded by a company developing research for Buchinger Wilhelmi;
• several authors were employed by, led research for, consulted for, or served on the board of the clinic or affiliated company;
• outcomes were measured before and after a short stay, not over years.

These conflicts do not erase the data. They reduce how far the results can be generalized and increase the need for independent, controlled, long-term research.

Safety is not a footnote

The Buchinger cohort excluded people with defined contraindications such as cachexia, anorexia nervosa, advanced kidney or liver insufficiency, severe cerebrovascular disease, dementia, pregnancy, or lactation.¹ Medication doses were adjusted during the stay.

The study reported transient symptoms and adverse events, including arrhythmia, hypoglycemia, a gout attack, and two hospitalizations. It also found increases in uric acid and clinically relevant changes for people taking anticoagulants, which the authors said require monitoring and medication adaptation.¹

Before either program, ask:

1. Which conditions or medications exclude me?
2. Who reviews my medication list before arrival?
3. Which laboratory tests are required?
4. How often are vital signs and symptoms checked?
5. Who can change medication doses?
6. What are the stop criteria for low blood pressure, hypoglycemia, arrhythmia, dehydration, gout, or other symptoms?
7. Where will I be transferred in an emergency?
8. How is food reintroduced after the restricted phase?

Do not reproduce either program without medical supervision.

Fasting evidence does not validate detox claims

The PLOS study measured weight, waist, blood pressure, laboratory markers, symptoms, and wellbeing during a supervised fasting stay. It did not demonstrate removal of unspecified environmental toxins or durable rejuvenation.

For a detox claim to be testable, a provider should identify:

• the toxin or compound;
• the validated measurement method;
• baseline and follow-up timing;
• the expected clinically meaningful change;
• the organ or disease outcome affected;
• a comparison showing the change is caused by the intervention.

Sweating, bowel cleansing, mud treatments, or a proprietary score should not be assumed to remove harmful substances from the body or slow aging.

How to compare the full cost

Request the same fields from both clinics:

1. program fee;
2. accommodation and room category;
3. number of nights and actual restricted-intake days;
4. meals or fasting provisions;
5. physician and nutrition consultations;
6. laboratory and diagnostic tests;
7. named treatment sessions and quantity;
8. medication management;
9. refeeding plan;
10. transfers, taxes, and service charges;
11. follow-up after departure;
12. cancellation or medical-interruption policy.

The Chenot CHF 5,500 fee is a useful public anchor, but only the final quote reveals the total. Buchinger’s package structure is public, but WLC does not publish a price it could not reliably verify.

Bottom line

Buchinger Wilhelmi offers a longer, medically supervised periodic-fasting model with observational evidence for short-term changes in selected participants. That study was uncontrolled, clinic-specific, partly self-reported, and closely connected to the provider.¹

Chenot Palace Weggis publishes a seven-night, 850-kcal Advanced Detox program at CHF 5,500, with consultations, proprietary diagnostics, and multiple treatments.² Its provider claims should not be treated as proof of detoxification, rejuvenation, or longer life.

Choose only after independent medical review and two complete written quotes. Compare nutrition protocol, contraindications, medication management, monitoring, refeeding, evidence, accommodation, and total cost. There is no supportable clinical winner from the current evidence.

Footnotes

1. Wilhelmi de Toledo F, et al. Safety, health improvement and well-being during a 4 to 21-day fasting period in an observational study including 1422 subjects. PLOS ONE. 2019;14(1):e0209353. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

2. Chenot. Advanced Detox at Chenot Palace Weggis. Provider program page accessed August 28, 2026. ↩ ↩² ↩³ ↩⁴

3. Buchinger Wilhelmi. Lake Constance arrangements and packages. Provider page accessed August 28, 2026. ↩ ↩²