The phrasing of “was caused by a worm that got into my brain and ate a portion of it and then died” implies that just a nibble of his brain was so toxic that it caused the parasitic worm to die. Hopefully RFK Jr. gets proper treatment and any lasting effects are healed. With a presidential race where the candidates’ mental faculties are such a point of contention, it seems like RFK Jr. will avoid much of the armchair doctors’ criticism despite his affliction because he’s not either of the two main candidates.