Higher the moisture content greater the chances of food spoilage.
On the basis of the moisture content food are classified into three categories :
1. Perishable foods: These cannot be stored for more than 2-3 days under normal conditions. For example, Milk and milk products, meat etc.
2. Semi perishable foods: Foods which do not require refrigeration, still have a limited shelf life. It can be stored for couple of weeks. For example, Cooking oil, butter, nuts, cheese etc.
3. Non-perishable foods: These can be stored for a longer time as compared to perishable and semi-perishable foods. For example, cereals, pulses, sugar, coffee and salt constitute this group.