Walnuts are rounded, single-seeded stone fruits of the walnut tree. The walnut fruit is enclosed in a green, leathery, fleshy husk. This husk is inedible. After harvest, the removal of the husk reveals the wrinkly walnut shell, which is in two halves. This shell is hard and encloses the kernel, which is also made up of two halves separated by a partition. Interestingly, the seed kernels — commonly available as shelled walnuts — are enclosed in a brown seed cover which contains antioxidants. These protect the oil-rich seed from atmospheric oxygen and prevent rancidity.
Walnut seeds are a high density source of nutrients, particularly proteins and essential fatty acids. Compared to certain other nuts, such as almonds, peanuts, hazelnuts, walnuts (especially in their raw form) contain the highest total level of antioxidants, including both free antioxidants and antioxidants bound to fiber. Walnuts, like other tree nuts, must be processed and stored properly. Poor storage makes walnuts susceptible to insect and fungal mold infestations.
I also read somewhere that whatever part of our body, a fruit, vegetable or nut reminds us of, that’s the body part or organ it’s good for. For example, the likeness of a walnut to our brain means that they are good for nourishing the brain. To me this sounds very plausible!