bread is thought to be sacred in some cultures, and it is very bad to throw it away.

if a person must through away bread, they should kiss it first. (cabo frio)

dropping bread crumbs on the floor is unlucky, and will cause bad things to happen (macaé).  

the bread distributed on the day of st. anthony (santo antônio) should be stored in the flour warehouse, so that the household will not run short of food.