They are rich in “heart-friendly” monounsaturated fatty acids like oleic, and palmitoleic acids with ZERO Cholesterol . These essential fatty acids help lower harmful LDL-cholesterol while increasing good HDL cholesterol in the blood. Cashew nuts are abundant sources of essential minerals. Manganese, potassium, copper, iron, magnesium, zinc, and selenium are especially concentrated in them. Cashews Are Rich in Heart-Healthy Fatty Acids.