In Western diets the ratio of n-6/n-3 fatty acids ratio may be as high as 15/1, whereas this ratio most probably was around 1/1 in the diet human beings have evolved on, and which has shaped our nutrition-related genetic make-up. Nutritionists therefore recommend counteracting the negative impacts of Western diets by enriching food with plant oils, or marine oils, rich in n-3 fatty acids, thereby bringing the dietary n-6/n-3 ratio closer to what human beings have become genetically adapted to. Oils rich in n-3 fatty acids, both marine oils and plant oils, can be used to adjust the n-6/n-3 balance of dietary lipids in a more healthy direction.