The blood type diet was made popular by Dr. Peter D’Adamo, a naturopathic doctor and author of the book “Eat Right 4 Your Type.” In his book and on his website, he claims that following a specific diet and exercise regimen based on your blood type can optimize your health and reduce your chance of developing particular health conditions.
This could be because the diet promotes healthy eating and exercise, which provides health benefits for people regardless of their blood type.
D’Adamo also claims that blood types represent the genetic traits of our ancestors, and his diet plans are based on the foods those ancestors thrived on.
For example, he claims that blood type O is the oldest blood type, associated with ancestors who were hunter-gatherers. He says that people with type O blood tend to be strong, lean, and have a productive mind.