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Fats and Oils Sometimes it is important to distinguish between fats and oils, or more completely, animal fats and vegetable oils. The distinction between these rests on what kinds of fatty acids went into the formation of that fat.
The softer a fat is, the more unsaturated it is. In general, vegetable and fish oils are rich in polyunsaturates; olive, canola and peanut oil are rich in monounsaturates, and the harder fats -- animal fats -- are more saturated (exception to this last rule are the tropical oils).