Put your skin on a moisture sandwich diet, and you’ll see a lot of gains in hydration. "Perfect for dry and dehydrated skin, a moisture sandwich locks moisture into your skin all day long without letting it evaporate," says dermatologist Dr. Geetika Mittal Gupta. "Clean your face and apply a hyaluronic acid-based serum on damp skin to help lock in the hydration. Layer on a moisturiser with the same active ingredient or glycerin to seal it in." Now this is one skin food we know you’ll love, especially for the summer.