The use of diet and nutrition as a medical treatment to manage disease, promote healing, and maintain health.
From 'diet' (food regimen) + Greek 'therapeia' (healing, treatment) + '-y' (creating a noun). Emerged as a formal medical term in the late 19th century as nutritional science developed.
Dietotherapy is one of humanity's oldest medical interventions—Hippocrates himself prescribed different diets for different illnesses, yet it's only in the last few decades that medicine has scientifically validated what ancient healers intuited for thousands of years.
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