SO contains more than 50% ω-6 polyunsaturated fatty acids (PUFAs), mainly linoleic acid (18: 2n-6). Polyunsaturated fatty acids-rich fat undergoes peroxidation causing free-radical-dependent damage to cells, as evidenced by increased production of pentane and MDA in animal and clinical studies (Levene et al., 1980 and Van Gossum et al., 1988).