There are many food items which can improve your nail health such as apples, Cucumbers, Eggs, Garlic, Grapes, Nuts, Onions, Salmon, Seeds, Soy, Tuna, Whole grains, etc. Unhealthy nails are the sign of poor health. Whenever we consume any food, the bacterias and germs of our nails also enter into our mouth along with the food which allows the entry of many diseases. A healthy diet can provide you a good general health as well as good nail health.