Monsters Inside Me (Animal Planet)

The  show's producers are apparently aware that half the attraction of a show like this is the gross-out factor, and they certainly play it up. But there's also some good information here, and while the narration is somewhat hyped up -- in one case, for instance, a parasite is described as eating a child's brain from the inside out -- it's not repeated endlessly (and, in fact, that's exactly what the parasite did to the child).

Also, the producers are pretty good about providing perspective on the actual incidence of the featured diseases -- one parasite, for example, is fairly common in Southeast Asia but extremely rare in the United States, while another parasite, while more common, very rarely infects humans. Bottom line? The real fun of this show is making folks go "eeew!" and it's very successful at that.