I'm not sure if this is what you are after, but the practice of some citizens of India, who burn the corpses of their deceased loved ones beside holy river banks (notably the Ganges) has apparently had some possible impact on Europe. It would seem that there is a living to be made by some people who gather the carcasses of dead animals from the river and sell these remnants to various renderers. The renderers in turn make things such as bone meal, and animal feed products from the carcasses. In the past these products were shipped to Europe and fed to livestock. What is interesting is that there is a fair percentage of human remains included in the rendering. The human remains that end up included in the garnerings of the gatherers are due to an absence of enough firewood to completely consume a human corpse (apparently in the neighbourhood of 5 cubic feet of hardwood and 8-10 hours tended burning is needed) and the variations that a river has in it's flow (and subsequent clearing/moving of part-burned human remains from the riverbanks). These remains have thus entered the food chain of humans because people eat animals which have eaten the animal feed. Which may be an avenue of spongiform encephalitis infection in Western Europe.
I am only going from memory of a chance-read recent newspaper article but perhaps a google of assorted key bits of this story would turn up some hard facts for you.
If you are interested
