The therapeutic use of sunlight.
- The ancient Greeks employed whole-body sun exposure or heliotherapy in the treatment of disease, and lying nude in the sun was a popular pastime.
- Early in the 20th century, the debate in the literature over the healthiness of heliotherapy and arc lamps provided the motivation for testing these ideas using animal models.
- Although heliotherapy has been practiced for at least 2400 years, there was very little objective evidence supporting its purported therapeutic influence.
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