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They did not have much knowledge on how to preserve food but discovered that smoked meat lasted longer than normal cooked meat
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Salt mines were discovered in austria and people found that when added to food (salt) the food could be eaten longer
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Ancient greeks discovered that you could preserve food by using ice or snow. Freezing food slows the growth of bacteria
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about 2600 years after the discovery of freezing food. the found that storage containers also helped prevent the growth of bacteria
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A french chef discovered that by cooking food the immediately placing it in metal cans preserves it for longer periods of time
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Pasteurization a method where you heat food to really high temperatures then u cool it immediately after, killing all the bacteria
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flash freezing food to a really cold temperature to stop the growth of bacteria
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A portable refrigerating unit was made for trucks and cars transporting food
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Freeze drying food so it lasts longer. This started when food started to be transported to the moon/space.
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Irradiation.Foods that are safe do not absorb radiation according to scientists. This method is widely used with strawberries, dried spices and poultry.