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They discovered that salt in food removes the water in food and bacteria cannot survive without water so the growth of baceria is slowed down
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They dicovered that food does not spoil when it is cooled by ice or snow so thats why we refrigerate our food to slow down bacteria in fresh food.
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They discovered that smoked meant last longer than regular cooked meant and later learned that it slowed down harmful bacteria
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Almost 2600 years after discovering that cold temperatures allowed foods to last longer.
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Canning was first invented by a chef in France named Nicolas Appert. He discovered that by cooking foods and sealing it in metal cans, the food would last longer, because when it is sealed inside a can the bacteria can't reach it.
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Pasteurization was discovered by Louis Pasteur, he heated foods to a very high temperature and then cooled them quickly. Most of the existing bacteria in the food or drink is killed during pasteurization. Then the food or drink can be sealed or kept cool to last much longer.
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Flash Freezing rapidly cools food to a frozen state and prvide improved food quality when the frozen food is thawed
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The first portable refrigerator unit fr trucks and trains was invented which allowed food to be transpoted between countries without soiling
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The foods were transpoted to the moon, astronauts tookd freeze-dried food with them
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Irradiation foods was approved by the USDA
