Yes, your ideas have certainly given me food for thought! A lecture that is food for thought should not be considered on impulse.
Vegetable patches or gardens, if permitted by the owner, supplied fresh produce to add to the rations.
Experts often recommend a combination of physical, social, psychological, and spiritual wellness for overall good health.
He also gave me some food for thought about my own writing in the future.
In a naive but expressive style of drawing and understated, tongue-in-cheek text he manages to insert subtle and serious food for thought.
Here are a few references to the phrase used by authors in their works.