A type of unsaturated fat, primarily derived from plants, which is usually in a liquid state at room temperature and also when chilled. Polyunsaturated fat helps to lower the overall cholesterol level, but it also reduces HDL or good cholesterol. The main sources of polyunsaturated fats are seeds, nuts, grains, and vegetables. Safflower oil has the highest percentage of polyunsaturated fat of any edible oil.
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