Food Preservation ⚫ The Nature of Food 1. The nature of food ⚫ Food is derived from animal or vegetable sources. Its organic nature makes it an unstable commodity in its natural form. ⚫ Various means can increase the natural shelf life of foods, thus reducing dependence on season and location.Food Preservation ⚫ The Nature of Food 1. The nature of food ⚫ Food is derived from animal or vegetable sources. Its organic nature makes it an unstable commodity in its natural form. ⚫ Various means can increase the natural shelf life of foods, thus reducing dependence on season and location