There are several studies available highlighting life expectancy data related to blood types. While most of the studies support the others, it must also be noted that in nations with high blood type B frequencies, life expectancy for people with blood type B appears to be significantly higher.
“In our patient population, the percentage of patients with group B blood declines with age. The survival curve in group B was worse than that in groups A, O, and AB. These findings suggest that in our patient population, blood group B is not a marker for longevity but may be a marker for earlier death.”
2015 study indicates lower life-expectancy for blood type B people
These findings suggest that in our patient population, blood group B is not a marker for longevity but may be a marker for earlier death. Based on a survey of 269 centenarians (people older than 100 years) living in Tokyo, Japan, it was suggested that blood type B might be a marker for longevity.
https://academic.oup.com/ajcp/article/135/1/96/1766172
Having a non-O blood group is associated with an increased risk of death, particularly from cardiovascular disease (such as ischemic heart disease and stroke), according to research published in open access journal BMC Medicine. These results could be used alongside of other measures for weighing up risk of death from certain diseases.
https://www.biomedcentral.com/about/press-centre/science-press-releases/15-01-2015
In conclusion, our retrospective survey showed that the percentage of people with group B blood declined with age. Group AB also had a negative correlation with age, although this was less pronounced: indeed, its effects were conditioned by gender, being significant only in females. The proportion of subjects with group A blood increased with age, but again this effect was significant only in females. Thus a conditioning effect of gender was evident for both A and AB groups. We have no explanations for these observations, although an association between B blood type and some aging-associated degenerative disorders, such as Parkinson’s disease, has been found
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385082/
And a large study suggested a correlation between blood type and longevity. People with type A, B and AB are at a higher risk for heart disease and shorter lifespan compared to O types. Non-O types were nine percent more likely to die over the course of the seven-year study period than O types.
https://www.huffpost.com/entry/blood-type-brain_n_6644816
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