Intead of two, I am giving five.
Five importance of food preservation are:
i)Food preservation adds variety to the food. For example, in the absence
of fresh peas during the hot summer months, canned or dehydrated peas
may be made use of.
ii) Food preservation increases the shelf life of food. Pineapples, cherries and other fruits and vegetables may be preserved by different methods for long periods of time.
iii)Food preservation increases the food supply.
iv)Food preservation decreases the wastage of food. Excess
foods which would have otherwise been wasted, when processed and
preserved add to the existing supplies, thus also decreasing the
wastage of food.
v)Food preservation decreases dietary inadequacies.
Variety in diet is brought about with the help of preserved foods. For
example, some Middle-East countries do not grow any vegetables due to
arid soil conditions, This shortcoming is overcome through the import
of fresh and preserved fruits and vegetables.
Hope it can help you.