Salmon. Salmon is a kind of food rich in omega -3 fatty acids, especially EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). These omega -3 fatty acids are beneficial to the skin, which helps to maintain the moisture and elasticity of the skin, reduce the dryness and inflammation of the skin, and help to reduce wrinkles and improve the smoothness of the skin. Although eel is also a nutritious food, it is not as rich in omega -3 fatty acids as salmon.