The black walnut is native to North America. The nut's extremely hard shell makes it difficult to crack open and so is not as widely known as the English Walnut. The nut of the black walnut has a strong, slightly bitter flavor, according to Epicurious website.
Calorie Content
Assuming one walnut weighs 0.75 g, the nutritional content listed here is based on 10.5 g, which represents six walnuts. There are 65 calories in six walnuts. Black walnuts are high in fat with 6.19 g total lipids per six walnuts. Of this fat content, 0.35 g is saturated fat; 1.57 g are monounsaturated fat; 3.68 g are polyunsaturated fat, according to U.S. Department of Agriculture National Nutrient Database.
Vitamins and Minerals
Walnuts contain minerals calcium, iron, magnesium, phosphorus, potassium, zinc, copper, manganese and selenium. Vitamin content includes vitamins A, C, E, carotene and B-vitamins -- thiamine, riboflavin, niacin, pantothenic acid, B6 and folate, according to U.S. Department of Agriculture National Nutrient Database.
Omega-3 Fatty Acids
Omega-3 fatty acids can lower blood fats called triglycerides. Black walnuts contain a significant amount of omega-3 fatty acids, making them a good food choice for a healthy heart, according to MayoClinic.com.
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