Relating to diet or nutrition, or concerning the food and drink regularly consumed by a person or group.
From Latin 'diaeta' meaning way of life or diet, originally from Greek 'diaita' meaning lifestyle or regimen. The word entered English in the 17th century as medical understanding of nutrition developed.
The concept of 'dietary' has evolved dramatically - ancient Greeks saw diet as encompassing entire lifestyle, not just food. Modern dietary science didn't emerge until the 20th century when vitamins were discovered, revolutionizing our understanding of nutrition from simple sustenance to complex biochemical requirements.
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