The latest pseudo (bogus?) scientific theory on diet is that people with different blood types should eat different foods. The idea goes that around half the population has blood type O because it's the earliest type to emerge in human evolution and has been inherited by more people. The theory also supposes that early humans' primary diet was meat; ergo, people with type O blood should have diets that rely heavily on meat. Other blood types evolved at later stages in human development and people with those blood types should have a diet consistent with the common diet at the time their blood type first appeared.

The theory sounds good except that prehistoric man was evidently a frugivore, not a carnivore. Still, I know people who plan their diets based on this theory and report good results.

      - Mark