O blood type is the universal blood type because people of this group can give blood to all other groups. With its capacity to donate in any blood type, there’s no factor in the erythrocytes of the blood O that can harm other blood groups but can receive only its the same blood type. This therefore what makes this type quite special.
Special because people with this blood type are known to have the leadership skills and focus. Attached to their best qualities are their high energy and pro-activity. This goes with their being productive at any work they are engaged in, powerful in their sense of purpose and has tendency to keep things organized as they planned it to be.
However, its “rareness” means being more susceptible to diseases than any other blood types. They are vulnerable to thyroid dysfunction, iodine deficiency, low levels of thyroid hormones and ulcers.
Besides, people of this type has less adaptability to stress. Type O response can cause bouts of excessive anger, temper tantrums, hyperacidity, and even create a severe enough chemical imbalance to bring about a manic episode. Since there is a powerful, synergistic relationship between the release of dopamine and feelings of reward.
Type O is more vulnerable to destructive behaviors when overly tired, depressed or bored. These can include gambling, sensation seeking, risk taking, substance abuse and impulsiveness. Greater tendency is put on stress though
Therefore to avoid becoming overstressed, Dr. D’Adamo recommends the following Type O diet, which focuses on lean organic meats, vegetables and fruits and avoid wheat and dairy which can be triggers for digestive health issues.
Moreover, he suggests that Type O’s should avoid caffeine and alcohol. Caffeine can be particularly harmful because of its tendency to raise adrenaline and noradrenaline, which are already high for Type O’s.