Freeze-dried food refers to a food preservation technique that involves removing water from food items by freezing them and then subjecting them to a process called sublimation, where the frozen water turns into vapor without passing through the liquid state. This process helps to preserve the food's nutritional content, flavor, texture, and overall quality over an extended period.
To freeze dry food, the items are first frozen to extremely low temperatures. Then, the pressure is reduced in a vacuum chamber. This low-pressure environment allows the frozen water to evaporate directly from ice to vapor, bypassing the liquid phase. This process effectively removes about 98% of the food's moisture content, leaving behind lightweight, freeze-dried food with a fun new texture!
The freeze-drying process offers several advantages. It helps to retain the original taste, aroma, and nutritional value of the food, including vitamins, minerals, and enzymes. Freeze-dried food is lightweight and easy to transport, making it popular for outdoor activities like camping, hiking, and backpacking. It also has a longer shelf life compared to fresh or dehydrated food, as the absence of moisture inhibits the growth of bacteria, yeast, and molds that cause spoilage.