Foods are preserved in friges baggies and or plastic containers.
It is not a fact that more foods were preserved in the past. More foods are actually preserved now due to advanced canning and packaging techniques.
fruit
Yes, preserved foods may be nutritious and useful; and frequently they are inevitable.
Fish, meats, cabbage, and beans are very commonly preserved by salt.
meats, fish, cheeses, vegetables,
sardinesExamples of preserved foods include jams, dried fruits, and canned sardines
Food that is not preserved by canning, dehydration, freezing or smoking.
Certain foods are required to be preserved based on their pH levels. For example, foods with a pH of 4.6 or less must be preserved because of their acidity.
Botulism is associated with canned foods and not fresh because the bacteria associated with it, Clostridium botulinum only lives in improperly canned and preserved foods.
He was clever and it taught us to understand how food was preserved as he found a way of keeping bacteria out of foods.
Some things are preserved because bacteria/virus etc. may develop or its quality will degrade if used after a long time while vice-versa is true of non-preserved foods.