Disclosed herein is a method for producing fry, which comprises cooking with an oil composition containing at least 15% by weight of diglycerides as a frying oil, wherein the content of nitrogen in at least 5 liters of the oil composition is kept to 0.2% by weight or lower.The method permits repeatedly producing fry good in appearance and flavor without causing coloring of an oil and emission of offensive odor in fry workshops, daily dish shops, eating houses, restaurants, etc. where fry is mass-produced over a long period of time using a diglyceride-containing oil composition having an effect to reduce the accumulation of body fat to prevent obesity.