LATIN DICTIONARYLexicon Latīnum
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“diet” in Latin

The English word diet itself goes back to Latin diaeta, through dieta.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

diet v.
victu curare morbos; victu mederi; diaeta curare (to cure by diet).
diet
diaeta: victus: ratio victus (Cels.): certus vivendi modus ac lex. lex quaedam ciborum (Cic.): rigid diet, abstinentia (abstinence in eating and drinking; as, to assuage fever by a strict attention to diet, abstinentia febrim mitigare, Quint., 2, 17, 9): too strict a diet, nimia abstinentia. The body is strengthened by exercise and attention to diet, corpus validius fit exercitatione et lege quadam ciborum (Quint.). Attention to one’s diet, ciborum observatio (Quint. 11, 3, 23). Maladies for which attention to diet is the best cure, ea corporis mala, quibus victus ratio maxime subvenit (Cels.). Strict attention to their diet and exercises, ciborum atque exercitationum certa necessitas (Quint. 10, 5, 15, of gladiators): a light diet, cibus infirmus (Cels.): to cure by means of diet, victu curare morbos; victu mederi; diaeta curare: to prescribe a strict diet, *legem quandam ciborum constituere.
Assembly of states, *consilium or conventus principum [☞ not comitia, which Nolten PROP. rejects].

Quick answer

What is the Latin word for diet?
The usual Latin words for “diet” are diaeta, vincō, cōnsilium; also abstineō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.