Horror movie title: The Previously Dead
I have been served brains before, and enjoyed them, insofar as one can enjoy something so similar to hard-boiled egg whites without benefit of deviled egg filling. This was long before people had worries about BSE or Creutzfeldt-Jakob disease and I think I have suffered no ill effect from the experience. Nor any especially potent beneficial effect, along the lines of "the best brain food should be brains," since after all it was a matter of consuming them, not acquiring a transplant or anything.
I notice that it is possible to buy a brain hat but they really should put on a warning that it intended only for those with short or no hair, which would be bound to spoil the effect. It is just the sort of thing one might wear to see a zombie movie hoping to score a reduced price ticket.