Trophotherapy is the treatment of disease through food — using diet as therapy, from the Greek trophe, nourishment, and therapeia, treatment. In its evidence-based form it is clinical nutrition: gluten-free diets for coeliac disease, ketogenic diets for drug-resistant epilepsy, low-sodium diets for heart failure, precisely calculated feeds for kidney disease. These are genuine therapies, prescribed and monitored like medicines. The word is also claimed by alternative practitioners promising dietary cures beyond the evidence, which is why the distinction matters: real trophotherapy is specific, dosed, and evaluated, not a vague prescription to eat clean. Food is powerful medicine when the prescription matches the pathology.