Nutrition and health care experts point out that vegetable oils with high polyunsaturated fatty acids, such as safflower seed oil, corn oil and sunflower seed oil, can reduce cholesterol in the blood. Moderate consumption (1-3 tablespoons per day) is beneficial to patients with heart disease, but excessive consumption can lead to some cancers and gallstones. Because polyunsaturated fatty acids are easily destroyed by oxidation in the body, they may become the cause of some heart diseases and cancers.

Vegetable oils containing monounsaturated fatty acids, such as olive oil, rapeseed oil and tea seed oil, are mostly used as edible oils. Among them, olive oil is the best, which will not only increase cholesterol in the blood, but also increase high-density lipoprotein beneficial to human health.