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Origin and history of dietetic

dietetic(adj.)

"pertaining to the rules for regulating the kind and quantity of food taken," 1570s, from Latin diaeteticus, from Greek diaitetikos "of or pertaining to diet," from diaita "way of life, regiment" (see diet (n.1)). Related: Dietical (1610s).

also from 1570s

Entries linking to dietetic

diet(n.1)

c. 1200, "regular food," from Old French diete (13c.) "diet, pittance, fare," from Medieval Latin dieta "parliamentary assembly," also "a day's work; daily food allowance, food," from Latin diaeta "prescribed way of life," from Greek diaita, originally "way of life, regimen, dwelling," related to diaitasthai "lead one's life," and from diaitan, originally "separate, select" (food and drink). This apparently is a frequentative of *diainysthai "take apart," from dia "apart" (see dia-) + ainysthai "take," which according to Watkins is from PIE root *ai- (1) "to give, allot."

From late 14c. as "customary way of eating," also "food considered in relation to its quantity and effects," and "a course of food regulated by a physician or by medical rules," often a restriction of food or certain foods; hence to put (someone) on a diet (mid-15c.).

The adjective in the sense of "slimming, having reduced calories" (Diet Coke, etc.) is attested by 1963, originally in American English. 

dietetics(n.)

"branch of medicine which relates to regulation of food and drink consumed," 1540s, see dietetic + -ics.

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