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Andreas Michalsen

Internist, Charité Berlin
DoctorEU
Longevity
Last updated: 7 October 2026

At a glance

  • Andreas Michalsen is a German internist and nutrition physician. He holds the chair in clinical naturopathy at the Charité in Berlin and is chief physician of internal medicine and naturopathy at the Immanuel Krankenhaus Berlin.
  • He is one of Germany’s best-known researchers on therapeutic fasting, such as multi-day fasts under medical supervision.
  • His group has studied fasting and diet in high blood pressure, rheumatic conditions and metabolic syndrome, as well as short-term fasting combined with chemotherapy.
  • He also tests other naturopathic methods in scientific trials, such as leeches for knee osteoarthritis, yoga and meditation.
  • His books on naturopathy and nutrition became bestsellers in German-speaking countries, and he appears regularly on German television. Parts of naturopathy remain scientifically controversial.
  • For longevity, he matters because he studies fasting and plant-based eating within a university hospital.
  • Takeaway: if you want to fast for longer than a day, do so under medical supervision, especially if you take medication.

Criticism and nuance

Some criticism of naturopathy

Recent

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