Crossword Genius

One unit of energy in relation to diet (7)

Ross

I believe the answer is:

calorie

(Other definitions for calorie that I've seen before include "Food energy unit" , "A recoil (anag.)" , "generating a bit of heat" , "Unit of heat (concerned with diet)" , "Unit of energy in foods" .)

I've seen this clue in the Sydney Morning Herald.
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