The present invention is directed to a functional food ingredient, comprising; a soy protein isolate, comprising; de-oiling hexane treated soybean flakes; heat treating the de-oiled hexane treated soybean flakes to a hexane content of below 200 parts per million at a temperature of from about 200.degree. F. to about 210.degree. F., wherein the soybean flakes are from high beta conglycinin soybeans; mixing the heat treated soybean flakes with water to form a slurry; removing fiber from the slurry to produce a liquor; adding an acid to the liquor to produce a precipitate of curds and a liquid of whey; separating the curds and the whey; washing the curds with water; adjusting the pH of the washed curds to about 7 and drying the pH adjusted material to produce a soy protein isolate having a beta conglycinin content of from about 35% to about 85% and a glycinin content of from about 5% to about 40%.