As there is high cholesterol in body why the patient need more fats and why the doctors are recommending it
Vegetable oils are rich in polyunsaturated fatty acids (PUFA). The fatty acids present in such oils have more than one double bonds. Doctors recommend such oils to patients suffering from high blood cholesterol or cardiovascular diseases. This helps in lowering the cholesterol level in blood. When vegetable oils are hydrogenated, the unsaturated fatty acids become saturated and the oil changes to solid fat (vanaspati and margarine).