Most Nigerians know their blood group — it comes up in school medicals, on hospital forms, and in premarital compatibility discussions. But beyond knowing whether you're O positive or AB negative, few people understand what their blood type actually tells them about their health.
What the science actually says
Blood type does have some legitimate health associations. People with blood group A have a modestly higher risk of cardiovascular disease compared to group O. Group O individuals have a slightly lower risk of heart disease but a higher susceptibility to certain infections, including cholera and norovirus. These are statistical associations, not certainties — they don't override lifestyle factors like diet, exercise, and medication adherence.
The genotype question
In Nigeria, the more clinically important conversation is often about genotype — specifically sickle cell trait. AA, AS, and SS are what most people are told to check before marriage, and rightly so. Two AS carriers have a 1 in 4 chance of having an SS child, which means sickle cell disease. If you don't know your genotype, it's a simple blood test available at any Healthrite branch.
The "blood type diet" — the idea that you should eat differently based on your blood group — has no credible scientific backing. It remains popular on social media but has been consistently unsupported by clinical evidence.
