Sigh. Yes, good hygiene practices like regular baths can be helpful. But the people in the middle ages shouldn't be criticized so much for not bathing. They recognized a hierarchy of sources of water, and they didn't have great access to regular supplies of clean water. River water, not so great, right? So they just couldn't afford to bathe frequently, and they certainly weren't about to do it with filthy river water. Their aversion to baths makes a little more sense that way, doesn't it? It's a question of technology.