Oreos are a popular type of cookie consisting primarily of sugar, unbleached enriched flour, high oleic canola and/or palm and/or canola oil, cocoa, high fructose corn syrup, leavening, soy lecithin, and chocolate. A serving size of three cookies contains approximately 160 calories, 7 grams of total fat, and 14 grams of sugar. Additionally, eating Oreos has very little nutritional benefit because they have minimal calcium and iron and no fiber or protein.