Quick to lay off food
I believe the answer is:
fast
This could be a double definition.
'quick' is the first definition.
(similar in meaning)
'lay off food' is the second definition.
'fast' can be an answer for 'food' (thesaurus). I am unsure of the 'lay off' bit.
'to' is the link.
Can you help me to learn more?
(Other definitions for fast that I've seen before include "Rapid - diet" , "At high speed" , "firm to > go without" , "Rapidly; tight" , "'Quickly, rapidly (4)'" .)