Traditional rapeseed oil has health disputes, and the stronger the taste, the better.
Anyone who knows rapeseed oil well knows that it has a "special aroma" and tastes green, which is mainly related to its "double height", that is, high glucosinolate (100~200μmol/g cake) and high erucic acid (20%-60%). These two substances not only affect the smell of rapeseed oil, but also have potential health hazards.
Glucosinolates are non-toxic, but under the action of glucosinolates, they will decompose to produce isothiocyanates, nitriles, cyanate esters and other substances, which will interfere with the synthesis of thyroxine and lead to goiter. Nitriles can also cause liver and kidney enlargement in animals, and even lead to liver bleeding and liver necrosis in severe cases.
As for erucic acid, early studies have found that it can increase the renal cholesterol of mice and other animals and limit the growth of mice and other animals.
Can't traditional rapeseed oil be eaten? That's not true. Actually, there is no need to panic too much. Because the residue of these substances in oil is very low, it is even less eaten by people. It should be understood that rapeseed oil is not as pure as it is nutritious.
The nutritional value of double low rapeseed oil is more prominent.
As the name implies, double low rapeseed oil has the characteristics of low erucic acid and low glucosinolate compared with traditional rapeseed oil. According to the national standard, the content of glucosinolates in double-low rapeseed oil
This improved rapeseed oil tastes better than traditional rapeseed oil, and has the characteristics of refreshing taste, non-greasy, light color and heat resistance. The most important thing is to fundamentally solve the adverse effects of erucic acid and glucosinolate on people and animals, and their nutritional value has also been highly praised by nutritionists in the United States and other countries. In Canada, the consumption of double-low rapeseed oil has accounted for more than 75% of vegetable oil consumption.
Compared with other vegetable oils, double-low rapeseed oil has lower saturated fatty acid content, higher monounsaturated fatty acid content and moderate polyunsaturated fatty acid content, which can lower blood cholesterol level and reduce the possibility of cardiovascular diseases.
● Saturated fatty acids: can increase the level of cholesterol in blood, thus increasing the risk of coronary heart disease. Therefore, the intake of saturated fatty acids should be reduced in daily diet.
● Monounsaturated fatty acids: It can reduce blood cholesterol level and low density lipoprotein (LDL), but does not affect high density lipoprotein (HDL). LDL is commonly known as "bad cholesterol", and long-term high level will increase the risk of cardiovascular disease; As a scavenger of excess cholesterol, HDL can control the cholesterol content and interfere with the deposition of cholesterol on the arterial wall.
● Polyunsaturated fatty acids: can reduce blood cholesterol levels, including α -linolenic acid and linoleic acid, among which α -linolenic acid can reduce the occurrence of coronary heart disease. The ratio of linoleic acid to α -linolenic acid in double-low rapeseed oil is 2∶ 1, which is also the most reasonable ratio in vegetable oil.