Turnips never seem to get the respect they deserve. This root vegetable is available year-round, is low in calories and is packed with vitamin C and potassium. If you can find turnips with the greens attached, you'll also get a host of nutrients including calcium, vitamin A and beta carotene. Dehydrating turnips is a fairly simple process that preserves most of the nutrients and guarantees that you always have deliciously crunchy turnips at the ready.