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In July 2003, the United States' Food and Drug Administration (FDA) approved the first qualified health claim specific to seeds lowering the risk of heart disease: "Scientific evidence suggests but does not prove that eating 1.5 ounces (42.5 g) per day of most nuts, such as pistachios, as part of a diet low in saturated fat and cholesterol may reduce the risk of heart disease". Although pistachios contain many calories, epidemiologic studies have provided strong evidence that their consumption is not associated with weight gain or obesity.
In 2014, Iran and the United States were the major producers of pistachios, together accounting for 76% of the total world production (table)
The pistachio (/pɪˈstɑːʃiˌoʊ, -ˈstæ-/, Pistacia vera), a member of the casew family, is a small tree originating from centeral asia and the Middle East The tree produces seeds that are widely consumed as food