3 Diets for 3 Blood Types

It has been hypothesized that each of the three blood types, A+/- and B+/- and O+/-, each developed due to differences among peoples' diets or available food sources. It is thought that type O+/- is the oldest blood type, probably being that of our early ancestors. However, type O+/- is developed via a defunct gene within human beings so this hypothesis is often criticized. Type A+/- is said to have originated in those people whose diets consisted primarily of grains; oats, barley, wheat, etc. This blood type would be indicative of people hailing from such a region as Europe; where grain is widely grown and makes up a major part of the diet. Type B+/- is said to have originated in individuals whose diet consisted of large amounts of animal protein. This blood type would be indicative of individuals hailing from say Africa or of Native Alaskans; both groups relying heavily on the abundance of animal protein in their environments. A fourth type, AB+/-, is said to be the re-merging of types A+/- and B+/- due to cultural mixing; as in high traffic immigrant countries like the United States. With respect to Mitochondrial Eve, type O+/- would be that of out common ancestors. Type A+/- individuals would have developed when people moved away from the fertile crescent, or another area of early human concentration, and into somewhere such as Europe where grains grow very well and large game was less abundant. Type B+/- individuals would have developed as people moved into such areas as Alaska and Canada, where large game is abundant and many crops do not grow well or even grow at all. This theory does indeed make sense, however, it is not without it's flaws.