Filed from 3 published puzzles

REGIMEN

Set to 3 different clues across 3 published puzzles, most often “Training recommendation” — The New York Times, Friday, 21 May 2010.

7 letters

Every clue on record, most used first

Training recommendationonce
The New York Times — Friday, 21 May 2010
Dietonce
The New York Times — Monday, 13 February 1995
Treatment planonce
The New York Times — Thursday, 15 December 1994

Other answers to these clues

FARE4 letters
LOFAT5 letters
LOWCAL6 letters
NOCAL5 letters
ONA3 letters
SLIM4 letters