There has been an increasing insecurity about food safety in recent years. Due to the ever-growing global population of people, healthy food will become increasingly scarce. This means that extending the shelf-life of food in a responsible way is becoming incre – asingly important. The actual health of food over longer periods of time in a responsible manner has received increasing amounts of attention over the past several years. Over the past few years, there has been increasing insecurity about the addition of chemical preservatives that occurs in some methods of food preservation. Many of these methods have been critically assessed and some have been found to carry significant health risks. Research has uncovered several foods and preservation methods that contain traces of foreign and sometimes harmful substances.