Boiled eggs not more than 10 minutes 
 
 
Source: Beijing times 

        Boiled egg looks be like simple, but bad masters duration, time is short, not cooked egg yolk; Time is too long, the eggs grow old it doesn't taste good. 
 
        Actually, want to master the boiled egg trick is easy: cold water pot, good 5 minutes after the water boiled, boil the egg had been killed the harmful bacteria and nutrients and more intact. 
 
        If the eggs in boiling water for more than 10 minutes, within a series of chemical changes will happen. Protein structure has become more closely, it is not easy to contact with protein enzymes in gastric juice, so difficult to digest. Egg protein contains more methionine, after a long time after heating, it will break down the sulfide, it reacts with the iron in the egg yolk and form the human body is not easy to absorb iron sulfide, nutrient loss more. 
 
        Not boiled eggs harm is greater. Raw eggs not only salmonella pollution problems, and the resistance of enzyme protein and avidin two kinds of pests. The former will affect the digestion and absorption of protein; The latter can combine with the biotin in food, lead to a lack of biotin, body produce mental fatigue, muscle pain and other symptoms. Once the egg is cooked, the above two kinds of material will be destroyed. 
 
        In addition, the egg can also master the following skills, in order to prevent the loss of nutrients, water must be no eggs, or less than water immersion protein coagulation not easily, affect the digestion; Boiled before put the eggs into the cold water soak for a while, in order to reduce the air pressure inside the egg; Then use the medium temperature, cold water to boil, can prevent the shell is broken, and avoid the loss of nutrients. 
 
        Beijing times reporter Xia Wen
 
 
 
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