Green english Walnuts unripe Persian Walnut (Juglans regia) with leaves on walnut tree branch 119078 Wallnuts

A walnut is an edible seed of any tree of the genus Juglans, especially the Persian walnut, Juglans regia. Medical benefits and claims Raw walnuts contain glyceryl triacylates of the n-3 fatty acid alpha-linolenic acid (ALA), which is not as effective in humans as marine n-3 fatty acids, and (mostly insoluble) antioxidants. Roasting reduces antioxidant quality. In 2010, a report published in the Journal of the American College of Nutrition said that walnuts and walnut oil improve reaction to stress. A study has suggested that consumption of walnuts increases fat oxidation and reduces carbohydrate oxidation without affecting total consumption, suggesting that walnut consumption may improve the use of body fat in overweight adults. Walnuts have been shown to decrease the endothelial dysfunction associated with a high-fat meal. Aged rats fed diets containing 2% to 6% walnuts showed reversal of age-associated motor and cognitive function, but a 9% walnut diet impaired performance, suggesting a J curve. On October 11, 2006, ScienceDaily published a report which stated "New research shows that consuming a handful of raw walnuts along with meals high in saturated fat appears to limit the ability of the harmful fat to damage arteries, " and attributed the result to a 2006 article in the Journal of the American College of Cardiology. The lead researcher, Emilio Ros, MD, PhD, was quoted as saying "People would get the wrong message if they think that they can continue eating unhealthy fats provided they add walnuts to their meals. Funding for the study was provided by the California Walnut Commission, an industry marketing agency.