Speaking biologically, fruit in a slightly shriveled state is holding its respiration and energy consumption down to the lowest possible level. It is like a person in meditation: his metabolism, respiration, and calorie consumption reach an extremely low level. Even if he fasts, the energy within the body will be conserved. In the same way, when mandarin oranges grow wrinkled, when fruit shrivels, when vegetables wilt, they are in the state that will preserve their food value for the longest possible time.