The Blood Type Diet by Dr. Peter D'Adamo works on the theory that people with different blood types digest food proteins in different ways. He offers diet plans for people with types A, B, O and AB blood, but he doesn't make distinctions within the groups between those whose blood is Rh positive or Rh negative. A person with B+ blood who decides to go on the Blood Type Diet should follow recommendations for those with type B blood. Mayo Clinic nutritionist Katherine Zeratsky notes there is "no solid research evidence" to support claims about the Blood Type Diet.
Meat and Fish
D'Adamo says people with type B blood tend to have strong immune and digestive systems that can tolerate a variety of foods. Eating meat is fine on the Type B diet, but D'Adamo says the menu should exclude chicken because it could lead to strokes and immune disorders in Type B's. Instead, he recommends eating what he terms "highly beneficial foods," such as lamb, mutton, goat, venison and rabbit. Some fish is fine, and eggs can be a good source of protein on the Type B diet.
Dairy Products
If you enjoy dairy products, you're in luck. Type B's can eat dairy goods on the diet, but use low-fat varieties. In fact, D'Adamo says, low-fat dairy can help encourage weight loss in Type B people.
Fruits and Vegetables
Type B's can eat plenty of fruit and vegetables on the Blood Type Diet. If you want to lose weight, D'Adamo says green vegetables are an especially good choice. A sample Type B meal plan on EveryDiet.org calls for a banana and grape juice for breakfast, green salad at lunch, fruit juice-sweetened yogurt for a snack and steamed vegetables and fresh fruit for dinner.
Diet No-No's
There are certain foods Type B's should avoid, according to D'Adamo, because they can be a big factor in weight gain. If you have type B blood, D'Adamo advises staying away corn, wheat, buckwheat, lentils, tomatoes, peanuts and sesame seeds. He says they can affect the metabolic efficiency in Type B's and lead to fatigue, hypoglycemia and fluid retention.
Diet and Exercise
A key to the Blood Type Diet is getting the right exercise along with eating the right foods. D'Adamo says Type B's should find exercises that challenge their minds as well as their bodies. Exercises should not be "too aerobically intense" and should involve other people. D'Adamo recommends tennis, martial arts, hiking, cycling and golf.
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