Fats with a high proportion of saturated fatty acids can deteriorate and become rancid, because they are converted to peroxides as they oxidize and decompose.

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Unsaturated fatty acids are much more likely than saturated fatty acids to become rancid as they decompose. Through oxidation of decomposition unsaturated fatty acids form peroxides that may be toxic in large amounts.

Fats with a High Proportion of Saturated Fatty Acids Can