For beautiful skin: a mix of Mediterranean, low-carb and Nordic diets + antioxidant-rich red fruits, polyphenol-rich vegetables, nuts, legumes, fatty proteins, offal and collagen.
4 coffees a day = ½ teaspoon of salt lost in urine. 1 hour of sport = ½ teaspoon of salt lost. In this case, you'd need 1 teaspoon full of salt just to recover the lost salt.