Etymology
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intake (n.)
c. 1800, "place where water is taken into a channel or pipe," from verbal phrase, from in (adv.) + take (v.). Meaning "act of taking in" (food, breath, etc.) is first attested 1808.
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dieting (n.)

c. 1400, "act of eating; act of regulating food intake according to regimen," verbal noun from diet (v.).

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aerobics (n.)
method of exercise and a fad in early 1980s, American English, coined 1968 by U.S. physician Kenneth H. Cooper (b. 1931), from aerobic (also see -ics) on the notion of activities which require modest oxygen intake and thus can be maintained.
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