If the fat body does go and dies on board, they could roll the fat body (don't want to throw it and cause permanant back injury) into the ocean. The fat body would finally be at home and provide a meal to the sea animals, not to mention the food that will be left over on the cruise in light of its absense. The ship will be able to go more quickly with less weight, thereby being more environmentally friendly. It would save space in the cemetery or reduce the chance of a grease fire at the creamatorium. There are no downsides!