How are blood groups and diets linked?

This diet works on the theory that the body has different reactions to food depending on a person's blood group. Each ABO blood type is categorized under the following diet profiles:

Type O: Meat eaters
Type A: Vegetarians
Type B: Omnivores
Type AB: Mixed diet eaters.
After finding out what group you fall into with a blood test, you have to strictly stick to the diet suitable for you:

Type O: The diet recommended for people with blood type O is simply a variation on many of the typical high-protein, low-carb diets that are currently popular, such as the Atkins diet. You can freely eat meat, fish and olive oil, while you can eat eggs, nuts, seeds, certain vegetables and fruits in moderation. It is recommended that you stay away from dairy products. To complement your food intake, you must engage in vigorous aerobic exercise as well such as running.
Type A: People with blood type A must avoid all red meat and dairy products. You should only eat a mixture of vegetable, seeds beans and cereals. You can do great on wheat (but not very high bran), idli, dosa, pasta, roti, bread, mung dal, channa dal, soya roti etc. This vegetarian diet should be combined with more gentle exercise such as yoga.
Type B: This blood group has the least dietary restrictions. You can eat most food groups including meat, dairy and vegetables. Avoid too many cereals like wheat (bread, sandwich, pizza, roti, sooji, etc.) Some dals (pulses) do well with this blood group like mung dal, channa dal, lobhia, rajmah etc. When it comes to exercise, Dr D’Adamo recommends activities that have mental component, such as hiking, tennis and swimming.
Type AB: People with this blood group has the friendliest immune system of all the blood types. It has most of the benefits and limitations of types A and B. Somewhat confusing when type B allows you to eat most foods, while type A suggests a vegetarian diet! Dr D’Adamo gets around this by suggesting that type ABs follow a veggie diet most of the time with some meat, fish and dairy products occasionally. It’s the same when it comes to exercise too – you should combine calming exercises with moderately intense activities.

Thanks a ton Shobha..for sharing this information..Its indeed a very useful information.