Tried a nutrition program (6)

I believe the answer is:

dieted

(Other definitions for dieted that I've seen before include "Went on strict food regime" , "Tried to lose weight" , "Followed an eating regime" , "Aimed to lose weight" , "Ate sparingly to lose weight" .)

I've seen this clue in the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.