For example, see this question, closed because of being unclear: When can eating fruits give maximum health benefits?
It is close because of asking for "the best". And as Carey Gregory says in the comment:
There's that word "best" again. Best health benefits in what way? [...] To make this question answerable you're going to have to define "best" and it's going to need to be a fairly narrow definition.
Many folks go to here and ask such questions. If I'm an asker, I would be irritated if my question gets closed without knowing the reason why. I have tried my best to give the detail, yet it is closed because of being unclear. If I'm a commenter, I would be irritated if I have to take about one topic from time to time.
I suggest to put that quote into the unclear tag. If possible, make a canonical question why there is no best in health, and show them that even outside health topic, asking for the best is still a wrong question (try asking a new question, then type
best on the title field).