diet
UK[ˈdaɪət]US[ˈdaɪət]
n
The kinds of food that a person, animal, or community habitually eats.
n
A special course of food to which a person restricts themselves, either to lose weight or for medical reasons.
v
Restrict oneself to small amounts or special kinds of food in order to lose weight.
Etymology
The word 'diet' entered English in the 13th century from Old French 'diete' and Medieval Latin 'dieta', both meaning "a daily food allowance." This Latin term derived from Greek 'diaita', which originally signified "a way of life, mode of living, regimen." The Greek concept was holistic, encompassing not just food but one's entire daily routine and habits for health. The semantic narrowing to focus specifically on food intake, and later to a restricted food plan, occurred as the word passed through Latin and French into English, reflecting a shift from a broad philosophy of life to a more practical, prescriptive dietary practice.
Analysis
The word 'diet' is a simplex loanword from Latin via Greek. It does not contain separable morphemes in its modern English spelling.
Examples
A balanced diet is essential for good health.
She went on a strict diet to prepare for the marathon.
Many doctors recommend a diet low in saturated fats.