"Is It True That People with Type O Blood Have Lower IQ?"

Clinically, the claim that individuals with type O blood have lower IQ lacks scientific basis. IQ is influenced by multiple factors, and blood type is not a crucial determinant of IQ levels. The innate factors of IQ primarily encompass genetics. However, genetics is not the sole determinant of IQ, and the heritability rate of IQ is not 100%. Even in specific scenarios, such as when both parents have type O blood and there are adverse genetic or environmental factors, these might impact fetal brain development. Yet, this cannot be generalized as evidence for lower IQ among individuals with type O blood. The development of IQ is also significantly influenced by postnatal education, nutrition, upbringing environment, and various other factors. These factors potentially have a greater impact on IQ than blood type. For instance, education level and quality, nutritional status, family and social environments significantly influence an individual's intellectual development.

Blood type primarily affects blood characteristics and susceptibility to certain diseases, not IQ. Clinically, there is no evidence suggesting that individuals with type O blood have lower IQ. Rather, IQ levels are primarily determined by a combination of genetic factors and postnatal education and nurturing.