There are many varieties of winter squash—including butternut, acorn, delicata and spaghetti squash—and they are all excellent choices in the winter. One cup of cooked winter squash has few calories (around 80) but is high in both vitamin A (214 percent of the recommended daily value) and vitamin C (33 percent), as well as being a good source of vitamins B6 and K, potassium and folate.