First-and second-grade oils have higher refining degree, higher purity and less impurity content, which can be used for cooking at higher temperature, such as stir-frying, but not suitable for long-term frying. Third-and fourth-grade oils are not suitable for high-temperature heating because of their low refining degree and dark color, but they can be used for soup and stew or stuffing. Consumers can choose according to their cooking needs and preferences.

No matter whether it is first-class oil or fourth-class oil, as long as it meets the national hygiene standards, it will not cause any harm to human health, and consumers can choose with confidence.

Extended data:

Benefits of rapeseed oil:

1, Qinggan cholagogic: People with hepatobiliary problems, such as fatty liver, hepatitis, gallstones or cholecystitis, must choose rapeseed oil when cooking.

2, anti-inflammatory skin care: rapeseed oil has anti-inflammatory effect. Raw rapeseed oil has a certain effect on scald, but cooked or refined salad oil does not. Rapeseed oil is very effective in conditioning skin problems, because it can not only enter the blood, but also enter the lung meridian to promote skin growth. Therefore, the ancients used it for external application to treat rubella, eczema and various skin itching.

3, eye protection: rapeseed oil is eye protection, regular consumption can prevent senile eye diseases. Rapeseed oil can also help eyes resist the stimulation of strong light, which is very helpful to prevent amblyopia in children.

4. Reduce fat and lose weight: Rape has a strong role in promoting fat decomposition. People with hyperlipidemia and obesity can lose weight by eating rapeseed oil.

Moreover, rapeseed oil is the most digestible oil, and its digestibility in human body can reach 99%. People with hepatitis and cholecystitis can't eat more other oils, and it's no problem to eat rapeseed oil.

Baidu Encyclopedia-National Quality Standard for Rapeseed Oil