Vegetable oil is good. Because vegetable oil contains more unsaturated fatty acids necessary for human body, it can lower blood cholesterol and reduce the risk of arteriosclerosis. Animal oil, on the other hand, contains more saturated fat and cholesterol. If eaten too much, it will easily harden blood vessels and cause diseases such as hypertension and coronary heart disease. Vegetable oil and animal oil are both raw materials to form human fat, but fat also has good fat and bad fat.

There are several types of fats: 1. saturated fatty acids; 2. Monounsaturated fatty acids; 3. Polyunsaturated fatty acids.

Most animal oils are monounsaturated fats, and most vegetable oils are polyunsaturated fatty acids.

1. saturated fatty acid: fatty acid without double bond. It is of little significance to human nutrition, and its function to human body is to provide heat, shock absorption, keep warm and protect organs.

2. Monounsaturated fatty acids: fatty acids containing a double bond. The nutritional value is not great, and it also provides human body with heat and energy. One of its characteristics is that it can be solidified and melted after heating. Monounsaturated fats include butter, sheep oil, lard and so on.

3. Polyunsaturated fatty acids: containing 2 to 6 double bonds (the more double bonds, the higher the degree of unsaturation and the higher the nutritional value).

Polyunsaturated fatty acids not only have nutritional effects, but also have preventive and therapeutic effects on cardiovascular diseases, cancer, childhood asthma and mental illness.

Such as peanut oil, rapeseed oil and sunflower oil. Especially linseed oil and olive oil are vegetable oils with high nutritional value. Among animal oils, only fish oil is polyunsaturated fatty acid, and salmon in deep sea is the best.