Then why are we urged to limit our fat intake ?Though theb jury is still out on whether certain fats cause cancer, transfatty acids. or oils (saturated) that have been treated in order to remain solid at room temperature--such as lard, butter and margarines--are chemically unstable and may be linked to cell damage. That also the case with polyunsaturates, which are found in abundance in the thee staple oils of Asian cuisine:peanut, soybean and coconut.