The oil used in McDonald's and KFC is shortening. When this oil is stored in KFC and McDonald's warehouses, it is packed in cartons, which are sealed in blue plastic bags and become milky white solid. This kind of oil has the characteristics of high temperature resistance and non-deterioration, but its cost is relatively high. Generally, only large chain restaurants will buy it and use it. After use, it will be discarded when it reaches the standard measured by PH test paper. So it is relatively hygienic.

The freezing point of palm oil is lower than that of ghee but much higher than that of common blended oil. This oil is easy to deposit in gastrointestinal tract, causing cardiovascular and cerebrovascular diseases. It has low cost and is commonly used in street stalls. For example, the price of edible oil in winter will be higher than that in summer, because the temperature in winter is low and once palm oil is added to the blended oil, it will solidify, and consumers can see with the naked eye that it will inevitably affect their purchase. It is not entirely because the oil price rises near the end of the year, but it is actually affected by cost factors.

compared with the above two oils, olive oil can be called "noble", and it is good for health if eaten often. It is often used in western family cooking. However, the cost of olive oil is extremely high, and blended oil is basically used for cooking in China. Of course, everything has a degree, and even the best things will go bad after this degree. The same is true of diet, reasonable collocation and moderate exercise is the way to health!