3: Ulcers
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Just like the way H. Pylori can increase the chances of stomach cancer in people with A and AB, it can increase the chances of ulcers in those with blood type O. According to the US National Center for Biotechnology Information (NCBI), the immune system of O blood people attacks H. Pylori ferociously. This intense attack leaves them with swelling, inflammation and stomach ulcers.
4: Cognitive decline
People with blood type AB should look away. According to researchers, people with blood type AB have an 82% greater risk of developing memory loss as they grow older.
