What makes you unique?
Because of their blood type they are predisposed to certain diseases, such as ulcers and thyroid dysfunction. Members of the blood group 0 often have low levels of thyroid hormone and inadequate iodine, a chemical element whose sole purpose is to regulate the thyroid hormones. This causes many side effects such as obesity, fluid retention and fatigue.
They also have higher levels of stomach acid than other blood types, often resulting in stomach irritation and stomach ulcers.