Agglutination is a very serious, and potentially life-threatening, phenomenon, whereby the red cells in the bloodstream stick together, forming irreversible clumps. Red blood cells deliver oxygen to the cells of vital tissues like the brain, heart and kidneys. To accomplish this delivery, red blood cells must flow through capillaries so narrow that they must line up single file. If the red cells are being agglutinated by lectins or anything else, clumps of red cells will clog up the capillaries and block the blood flow. Thus, the blood stream will be prevented from delivering its life-sustaining cargo of oxygen to the tissues served by those capillaries.
Cells deprived of oxygen become damaged, and eventually die.
Thus, according to D'Adamo's theory, everyone experiences repeated showers of agglutinated red cells throughout their bloodstream, day after day, month after month, year after year. If the capillary beds in your heart, lungs, kidneys, brain, eyes, and other essential organs are subjected to a repeated barrage of agglutinated red cells, they will eventually begin to clog up, resulting in tissue damage. The brain, heart, lungs, kidneys and adrenals would soon be irreparably damaged by these processes, which could prove fatal for millions of people. The existence and intricacies of such a widespread disease would be as well-known as is atherosclerosis. Yet, I am aware of no such description in the pathologic literature and no pathologist I know has ever mentioned this as a cause of any disease in humans.