Let's start off with water. We've always been told to drink eight to 10 glasses of water daily. This is because each and every cell in the body requires water to function. It is the water in our skin cells that give its supple feel.
But skin will only stay supple while its moisture-locking barrier is intact. Once its gone, you're going to start showing signs of water-loss (wrinkles, dryness, flaking, etc.). To make sure that the moisture stays in, try including omega-3 fatty acid-rich foods like salmon and tuna to your diet.