Buchinger Wilhelmi Lake Constance

The one thing

In 1919, a German naval doctor named Otto Buchinger could barely move his own joints and had run out of answers from the medicine he practised himself. He fasted for nineteen days under a colleague's supervision and came back able to work again, and the method he built from that recovery, structured therapeutic fasting with medical care at its centre, is what guests still come to this clinic on Lake Constance to do. Buchinger framed it as a cure for the whole person rather than the stomach alone, and he gave it three deliberate parts: the medical oversight that runs through every stage of a fast, what he called dietetics for the soul, built from music, contemplation and the lake itself, and the shared experience of doing it together with other guests rather than alone. Nearly a century on, the clinic is still run by his own descendants, now a fourth generation, and that unbroken family lineage is part of what sets it apart from the newer wave of fasting retreats borrowing the idea without the history behind it.

The verdict

This is a clinic, not a hotel, and it says so plainly about itself. Guests come for a defined medical programme rather than a conventional spa break, and that honesty is itself part of what the people it suits come looking for. The Lake Constance site opened in 1953, started by Otto Buchinger alongside his daughter Maria and her husband, and the family has kept it in the decades since, marking seventy years on the lake in 2023 with a chronicle of the clinic's own history and archive footage of Buchinger himself. The clinic co-founded the German medical association that still sets national guidelines for therapeutic fasting, funds its own research through a dedicated foundation, and takes part in registered clinical trials into long term fasting, so what happens here sits inside an active, documented medical field rather than one operator's private method. Food across the site has been fully organic, Demeter and Bioland certified, for the last two decades, and that discipline in the kitchen runs as deep as the medical programme it supports.

The water

The clinic sits high above Lake Constance in Überlingen, with views reaching out across the water to Mainau Island and the Alps beyond. A new thermal and sauna area opened in January 2026, built around a panoramic Finnish sauna looking straight out over the lake, a gentler bio-sauna, infrared heat and salt inhalation, with heat rituals led by a former world Aufguss champion and a cold plunge pool due to follow later in the year. There is an indoor pool on site, and rooms range from a snug retreat style room up to lake view suites finished in materials and colours drawn from the region around them. The feeling throughout sits with calm and quiet rather than spectacle, which is exactly right for a programme built around rest.

Treatments

A stay opens with a full medical check, and from there the shape of each day is set by the clinic's doctors rather than chosen from a treatment menu. A short digestive rest begins the programme, followed by a liquids only fasting phase built from broths, fresh pressed juice and herbal tea, with a daily consultation, blood pressure check and weigh in built into every single day. Guests are offered yoga, guided walks, meditation and talks alongside the medical side of the stay, and the fast closes with a slow, carefully staged return to food that starts as gently as a single piece of fruit before building back up gradually over several days. Programmes run from a shorter, non fasting stay up to a full ten day or three week fast, with longer stays available for guests working with their own doctor toward a more extended reset.

Getting in

Booking runs directly through the clinic's own site or by phone, with no outside agent standing between a guest and the medical team they will be working with. The nearest airport is Friedrichshafen, around forty minutes away by car, with Zurich and Stuttgart both a little under two hours as alternatives, and the clinic is also reachable by train to Radolfzell, Singen or Friedrichshafen followed by a short taxi ride. Guests taking part in the clinic's own research are invited to contribute their results to its longer term studies into fasting, an option rather than a condition of staying, for anyone who wants their week here to add to the evidence base as well as their own health.

What to know before you fall in love

The daily medical checks described above are non negotiable rather than optional, and enemas are a standard, expected part of the programme rather than something a guest can decline and still complete it. There is no alcohol and no coffee during the fast itself, and guests are asked to ease back into both slowly once it ends. The first few days commonly bring headaches, light headedness and low energy as the body adjusts, which the clinic treats as a normal, expected part of the process rather than something to play down beforehand. The interiors lean plain and calm rather than lavish, because the investment here goes into medical rigour and the lake setting rather than conventional five star decor, and anyone picturing a typical luxury hotel room should know that before they book.

Best for

Anyone who wants to fast properly, under real medical supervision, at the clinic where the modern version of the method was built and is still run by the family who built it. Best suited to guests who are genuinely drawn to the discipline of a structured fast rather than a gentler wellness week, and who would rather put their trust in decades of clinical experience than a newer operator's marketing. Equally well suited to a returning guest who has fasted here before and wants to go deeper, since the clinic builds longer stays around exactly that kind of repeat commitment.