food for thought

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food for thought (uncountable)

1. (idiomatic) Information or knowledge that is worthy of contemplation.
   • 2019 October 23, Pip Dunn, “The next king of Scotland”, in Rail, page 55:

     If I were ScotRail management, I'd be looking at the feasibility of taking some more trailer cars to make them five-car sets, and even the possibility of using them on the West Highland, Kyle and Far North lines as well (although I fear that is a cost too far, but food for thought).

• soul food

• grist for the mill

• “Food for thought”, in BBC Learning English‎, BBC, 2014 September 14