I have recently been tipped off to an interesting concept.
If someone is lactose intolerant (like myself) that means I do not have the bacteria/enzymes to digest the lactose in dairy products.
Yogurt has "built-in" bacteria cultures that are capable of digesting the lactose. Consider them a probiotic.
The idea is that with enough yogurt consumption one should be able to populate yourself with enough bacteria to digest the dairy, thus eradicating the lactose intolerance.
I might give this a shot.