Fruits and Vegetables That Should Not be Peeled 

Potato Potato skins and sweet potato skins alike are loaded with filling fiber as well as iron and potassium.

Carrots Most of the vitamin C and vitamin B3 found in carrots is actually concentrated in the skin and the layer just below the skin

Eggplant Eggplant is rarely eaten raw, and the skin gets soft and tender when cooked. So, there's no reason to peel it.

Cucumbers Cucumbers have an incredibly high water content, meaning you'll find most of the healthy stuff in the skin.

Kiwis Eating kiwi skin will triple the amount of fiber you get from the little fruit.

Zucchini Zucchini and its yellow counterpart, summer squash, offer good-for-you perks like high levels of antioxidants and both soluble and insoluble fiber.

Oranges Oranges and other citrus fruits are not only some of the best antioxidant-rich foods you can eat, but their peel is also beneficial.

Pumpkins Pumpkins, technically a fruit, and winter squashes have skins you can only eat if you cook