Unique among nuts, walnuts contain the highest amount of ALA.
Unique among nuts, walnuts contain the highest amount of alpha-linolenic acid (ALA), the plant-based omega-3 essential fatty acid, required by the human body. As one of the best plant food sources of omega-3s, a one-ounce serving of walnuts provides 2.5 grams of ALA. A growing body of scientific evidence is beginning to uncover a variety of benefits that ALA/omega-3s may provide to our bodies. While most nuts contain monounsaturated fats, only walnuts are comprised primarily of polyunsaturated fat (13 grams out of 18 grams total fat). Dietary guidelines recommend that people keep total fat intake between 20 to 35 percent of calories, with most fats coming from sources of polyunsaturated and monounsaturated fatty acids.