Once a piece of fruit or a vegetable is picked, it starts to go bad. One common way to slow or stop that spoilage is to remove water from the food. That process – dehydration – typically involves heat. But heat can destroy a food’s nutrients. Now, researchers have come up with a more energy-efficient way to dehydrate food without heat. It could help keep dried fruits and veggies more wholesome and more flavorful, they say, sciencenewsforstudents.org reported.