And yep, they really work.
That's because freeze-drying removes about 98 percent of the water in foods. This is done via a large freezer, which covers the food in ice crystals. Then, the food is vacuum-sealedDehydrating foods, however, removes only about 80 percent of the water, and typically doesFood dehydration is typically done in the sun or via air-drying, Gans says, but there are also dehydration machines and ovens that work by circulating air at very high temperatures to draw the moisture out of food.
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