the skin during winter time has more tendency of getting dryness. To prevent it, have the foods, which has "mutin". The mutin has slippery and sticky tendency, and aslo makes the skin moisture and springy. The foods which has lots of mutin are yam, taro, okra, dried persimmon, sea mustard (seaweed), fermented soybeans, oyster, sea cucumber and cooked jelly halibut.
And also the last food you can eat is a mild exercise to sweat for wetting your skin.