Second, the edible oil has exceeded the shelf life for a long time, and even if it is unopened, it cannot avoid oxidation. Even if the color is still pure and there is no smell, don't force it.

Three, the harm of expired edible oil to the body is as follows:

1 is toxic to gastrointestinal tract. The more serious the deterioration of edible oil, the stronger the reaction, accompanied by nausea, vomiting, abdominal pain, diarrhea and other symptoms.

2. Harmful substances such as peroxides produced by deteriorated oils will change hemoglobin from ferrous iron to ferric iron, which will make hemoglobin lose its oxygen-carrying ability, lead to hypoxia and severe cyanosis of mucosa and skin.

3. The rancid substances have a direct destructive effect on magnesium succinate and cytochrome oxidase in vivo, interfere with intracellular tricarboxylic acid circulation and oxidative phosphorylation, hinder intracellular energy metabolism, cause intracellular asphyxia, and seriously lead to respiratory and circulatory failure. Injury is sometimes potential and gradual. Anyway, you can't indulge yourself if you eat too many bad things, and something will happen sooner or later if the harm is superimposed.