Fatty fish, like salmon, are rich in omega-3s and a good source of lean protein, Factor says.
Salmon, herring, and mackerel also have nutrients that may promote hair growth and are good sources of protein, selenium, vitamin D3, and B vitamins.
Eggs are a great source of skin-loving "protein, healthy fats, and antioxidants," as well as iron, zinc, biotin, choline, riboflavin, phosphorus, selenium, and vitamins A, B12, and D.
Vitamin D in eggs protects the skin from UV damage and reduces inflammation.
Spinach contains calcium, chloride, iron, magnesium, manganese, potassium, choline, folate, riboflavin, and vitamins A, C, E, K, B6
Kung says these nutrients are important for healthy skin, hair, and nails.