I was reading an essay written by one of my colleagues. He used following sentence in his essay:
The matter which needs food for thought is who should take responsibility for the young ones.
I think the phrase "food for thought" can only be preceded by words such as provide or give. For example,
The matter which provides food for thought is who should take responsibility for the young ones.
However, in the above sentence, he meant that the matter which should be delved further is "who actually among the parents should take responsibility for the young ones.", so here " provides food for thought" can't be used.
His entire para was as follows:
Nature has blessed females with extraordinary qualities, which help them in taking care of their child. However, in the modern era where both of the parents are finding it difficult to juggle the two responsibilities: office work and providing care to the child, the matter which needs food for thought is who should take responsibility for the young ones.
If the idiom "food for thought" is not suitable in this context, please suggest which idiom can be used in its place.