Who can tell me the advantage and disadvantage of oil

Oil is any of a group of liquid edible fats that are obtained from plants or animals.In our life,oil is called ebible oil.When it comes to this,some people thinks it is good for health,there is a public debate today that most of chinese enjoy oil.In that way,person who often consumes oil proves that fats--proved by expert of physical health--oil can reduces the probability of suffering from heart diseases,suppresses the cardiovascular diseases,helps to the function of digest and assimilate and helps to prevent the skin disease,etc.
Now there is a growing awareness that the edible oil is very apt to be rotten, because oil will will be oxidized automatically that will produce a lot of poisonous oxidizing and resolving materials.
If people eat the oil of the degradation for a long time, will make cell's function depleted , will bring out many kinds of diseases.But that is only part of the history,another equally important aspect is the more serious one ,which is the poi