I need advice about something called the "Eat Right for Your Blood Type" diet.

I got a chart from a friend of mine who swears that this particular diet works amazingly well. I’m not really overweight, but I’m experimenting with diets that will improve my overall health and thinking.

The chart prohibits me from eating chicken! Chicken is prohibited to people with B blood type.

Does anyone know why chicken would be prohibited? My friend doesn’t have an answer, although she has the book that explains the whole diet.