Unlike supposedly scientific opinions heard now and then, nutrition has an affect on the skin only when the body lacks vitamins and minerals. When a person eats traditional food and doesn't lack a specific ingredient, the food preserves the existence of the skin, as the existence of other organs, and not more than that. The food does not make the skin fresher, smoother or younger.
If a person eats traditional balanced food, the skin does not look healthier due to over eating of particular types of food such as vegetables, fruits, eggs, almonds, nuts and so on.
Let's count a few ingredients in our nutrition, which in states of lack may affect the skin, and describe the different affects. (Note that we'll describe the affects on the skin alone and not on other systems).