Council for healthy eating (4)

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'council' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for diet that I've seen before include "Legislative assembly; food regimen" , "Try to lose weight" , "Health food - Council" , "Weight-loss plan" , "Eat sparingly" .)

I've seen this clue in the Evening Standard.

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