IQ refers to intelligence quotient. IQ, or Intelligence Quotient, is an index that compares an individual's intelligence test scores with those of subjects of the same age. It is a standard for measuring the level of an individual's intelligence.

Wechsler assumed that people's IQs are normally distributed with a mean of 100 and a standard deviation of 15. Therefore, as long as we can calculate the difference between a person and the mean of his group in units of standard deviation, we can find his IQ.

Factors affecting IQ

1. Heredity: Generally speaking, if parents have high IQ, their children will not have low IQ. This genetic factor is also reflected in blood relationships. Children whose parents are both locals have an average IQ of 102; while children born to parents who marry in other provinces have an IQ of 109; and if the parents are cousins, the number of children with low IQs increases significantly.

2. Breast milk: Breast milk contains a variety of active substances that promote children's intellectual development. In particular, taurine, which has an important impact on intellectual development, is 10 times higher than that of milk. According to surveys, children who grew up on breast milk have IQs about 3 to 10 points higher than those who grew up on milk substitutes.

3. Diet: A monotonous diet leads to a lack of certain trace elements, or a diet that is too small or a serious lack of protein and other nutrients can lead to stunted IQ development. Excessive intake of multiple metal elements such as lead and copper can also affect IQ.

Reference for the above content? Baidu Encyclopedia-IQ