1 feb 1839 año - "Dietetics" is defined in the dictionary
Descripción:
 "In 1839, Dunglison Medical Lexicon, a dictionary of medical science, described “dietetics” as “a branch of medicine comprising rules to be followed for preventing, relieving, or curing diseases, by diet.”
Source: https://eatrightfoundation.org/who-we-are/academy-history-timeline/ 
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fecha:
1 feb 1839 año
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 ~ 186 years ago