They are very important , especially where foodstuffs of animal origin are processed . Contaminated products from these sources can lead to and are associated with microbiological and chemical hazards . Although this can conflict with efforts to reuse food waste ( such as in animal feed ) , safety regulations are in place to ensure the health of the consumer ; they are vitally important , especially in the processing of foodstuffs of animal origin ( e.g. meat and dairy products ) , as contaminated products from these sources can lead to and are associated with microbiological and chemical hazards .