Food for thought. What does it mean? It's an idiom describing something that requires more thought and consideration.
It’s an expression that has been around since the 19th century, and is based on the idea of digestion and transferring it from the stomach to the brain.
Example: My manager’s advice on how to react to a difficult situation provided me with food for thought.
It means that the advice my manager gave me was information I needed to consider and give more thought to. I could have said that instead of “food for thought”, but that’s what makes the English language so much fun. We have so much variety in how we communicate.