Mainly dried foods are used; they minimize the weight of food at take-off and water can be recycled.
To keep food from spoiling and keep it cold.
In the start, it was difficult because of spoiling. But now the food is frozen to keep it from spoiling.
Depending on the type of the food many methods of preservation exist: adding sugar, salting, irradiation with gammas, freezing, lyophilisation, pasteurization etc.
They cover it in salt. this preserves it.
Put it in the garbage (Kidding)
In the past people used to pickle or cure their foods to keep the food from spoiling. And over the many years the refrigerator and freezer have made these methods less of a necessity than they once were.
the food wraper that keeps an apple from spoiling would be not a container but lemon juice keeps apples from getting brown and ishy ~ godd luck
Preservatives are used to keep food from spoiling. The ubiquitous monosodium glutamate is the most famous of these and is found in virtually everything.
preservatives are used in foods to keep the food from spoiling in a short period of time
Low temperatures keep bacteria from growing rapidly and spoiling the food.
Food is spoiled by living things such as bacteria and molds. They ruin your food when they eat it. The food inside a can is heated to kill the bacteria and molds. Then each can is sealed to keep any more from getting in.
Aboriginal people stored food in caves or in the ground to keep it cool. They also preserved meat with salt and other spices to keep it from spoiling.