Walnuts have often been thought of as a "brain food," not only because of the wrinkled brain-like appearance of their shells, but because of their high concentration of omega-3 fats. Your brain is more than 60% structural fat. For your brain cells to function properly, this structural fat needs to be primarily the omega-3 fats found in walnuts, flaxseed and cold-water fish. This is because the membranes of all our cells, including our brain cells or neurons, are primarily composed of fats. Cell membranes are the gatekeepers of the cell. Anything that wants to get into or out of a cell must pass through the cell's outer membrane. And omega-3 fats, which are especially fluid and flexible, make this process a whole lot easier, thus maximizing the cell's ability to usher in nutrients while eliminating wastes--definitely a good idea, especially when the cell in question is in your brain.
Alpha linolenic acid, the omega-3 fat found in walnuts, promotes bone health by helping to prevent excessive bone turnover-when consumption of foods rich in this omega-3 fat results in a lower ratio of omega-6 to omega-3 fats in the diet.(Griel AE, Kris-Etherton PM, et al. Nutrition Journal).
Walnuts are a very good source of manganese and a good source of copper, two minerals that are essential cofactors in a number of enzymes important in antioxidant defenses. For example, the key oxidative enzyme superoxide dismutase, which disarms free radicals produced within cell cytoplasm and the mitochondria (the energy production factories within our cells) requires both copper and manganese.
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