If you find yourself adding extra salt to everything, you might want to cut back, as it can dry out your skin. A recent study found that salt may be a contributing factor to certain health conditions, including allergies and eczema.

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"Vitamin A is a popular supplement in controlling acne. It can help acne prone skin by normalizing oil production," says Eidelman. "In those cases, the skin will be more balanced and clearer." There's a downside, though: "Too much vitamin A, usually resulting from the over use of oral supplements, can create changes in vision, appetite and drying of the skin or nails," he explains.

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As Eidelman noted earlier, sugar can lead to a dry complexion — and he's not alone in being wary of the stuff. Sadly, sugar is reviled by many dermatologists: In addition to being potentially drying, it also contributes to the breakdown of collagen (which keeps your complexion bouncy), can lead to breakouts and can even clog your pores.

A sad day for donuts, indeed.

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White rice, bread, and pasta are all high-glycemic carbs, which are just as bad for you as sugar and contribute to the same skin issues. This is a case where swapping out your white rice for brown rice; your white bread for whole wheat bread, can make a big difference.

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