General English

General Science

  • noun a measured amount of food eaten to maintain, gain or lose weight
  • verb to reduce the quantity or change the type of food eaten in order to maintain a sensible weight and become healthier


  • noun the amount and type of food eaten


  • adjective used for describing a food or drink that is intended for people trying to lose weight, usually because it is low in calories or fat, or contains a sugar substitute
  • noun the act of eating only particular types of food, in order to become thinner, to cure an illness or to improve a condition
  • verb to reduce the quantity of food you eat, or to change the type of food you eat, in order to become thinner or healthier


  • noun
    (written as Diet)
    the legislative body in Japan and some other countries

Origin & History of “diet”

Diet comes, via Old French diete and Latin diaeta, from Greek díaita ‘mode of life’. This was used by medical writers, such as Hippocrates, in the specific sense ‘prescribed mode of life’, and hence ‘prescribed regimen of food’. It has been speculated that Latin diaeta, presumably in the yet further restricted sense ‘day’s allowance of food’, came to be associated with Latin diēs ‘day’. This gave rise to medieval Latin diēta ‘day’s journey’, ‘day’s work’, etc, hence ‘day appointed for a meeting’, and thus ‘meeting (of legislators)’. English acquired this word (coming orthographically full circle as diet) in the 15th century, but it is now mainly used for referring to various foreign legislatures.