"I highly recommend the diet program explained in Eat Right 4 Your Type by Dr. Peter D'Adamo. When I read the book in the fall of 1997, I was impressed with D'Adamo's research behind the diet and the simple logic that is the diet's foundation."

-Machaelle Small Wright (Perelandra)

Advanced Topics in Blood Type Diet



A small number of foods have had value changes since ER4YT

Virtually all of the changes are lectin-related (leeks, pinto beans, sunflower products for type O, changes to certain mushrooms for type A and AB, for example).  Many of these newer values are the result of determinations which are way beyond the level of sophistication that I was using back in the 1980's.  In particular, the molecular biology of lectins and cancer cells is still beyond my current capabilities, so we must rely on the literature for that research.  Many dietary lectins can have a mixed function; some effects good, others bad.  Sometimes we learn of one before the other.  Pinto beans, leeks and mushrooms are good examples of lectin-containing foods with complex and mixed biological effects.  Because knowledge of these relationships continues to expand (for example, the link between polyamine production and lectins was not understood well at the time of ER4YT) some begin to look better (mushrooms) while others begin to look worse (pinto beans).  The added criteria of nonsecretor reaction have generated a yet higher level of refinement in the food value arena.


Can be considered NEUTRAL.


Tier One is the basis of the diet for everyone.  

If you simply wish to maintain and enhance your current level of health, use Tier One as your staple foods, and choose freely from Tier Two and the Neutral Tier for added variety.  For you, the "avoid" foods listed in Tier Two can be considered "neutral."

Tier Two values should be used as written if you are seeking to resolve an illness, heal from injury, lose weight, bear up under added stress, or to alleviate chronic fatigue or other health issues -- or if you are following the diet according to your status as one of the variants nonsecretor, MM or A2.  Minimize your use of Neutral foods.  This is the "turbo" version of the diet, designed to speed healing and provide added protection against disease.

Note:  if you are a nonsecretor and MM, use the nonsecretor values in preference to the MM values.  For instance, tomatoes are to be avoided by type A secretors; they are neutral for type A nonsecretors.  With the MM variant, they are considered "beneficial."  This applies to secretors only.



  • Goat is Neutral for AB secretors and nonsecretors.

  • Sweetbreads are a Tier I Avoid for all type As and type B secretors and Neutral for type B nonsecretors.

  • Chub is Neutral for type A secretors and Beneficial for type A nonsecretors.

  • Gray Sole is a Tier I Avoid for type AB secretors and nonsecretors.

  • Trout of all varieties is a Tier I Avoid for type B secretors and nonsecretors.

  • Quark Cheese is a Tier II Avoid for type A secretors and nonsecretors.

  • Egg (chicken), missing from the type AB diet, should be listed as Neutral for secretors and Beneficial for nonsecretors.  

  • On p. 263 of the type B diet, the item RICE is missing, though various rice products are listed. It is TIER I Beneficial (B secretor and nonsecretor). 

  • Asparagus pea is unlisted for ABs and Os.  It is Neutral for all types.  

  • Oyster and Portobello Mushrooms are Neutral for all type ABs.  

  • Oyster plant is Neutral for all ABs and Os.  

  • Bitter melon is missing from the type A and B fruit lists. It is a TIER I Avoid for both A and B secretors and nonsecretors.

  • Cherry Juice (Black), unlisted for Bs, is Neutral for secretors and Beneficial for nonsecretors.  

  • Coconut, unlisted for Bs and Os, is a Tier II Avoid for both secretors and nonsecretors.  

  • Coconut milk, unlisted for ABs, is a Tier II Avoid for both secretors and nonsecretors.

  • Persian melon is missing in the AB and O lists.  It is Neutral for all types.  

  • Under the type A diet, Pumpkin Seed is missing.  It is TIER I Beneficial (secretor and nonsecretor).

  • Jam/Jelly (OK Ingredients) is Neutral for all. 

  • Rice Vinegar follows the values for Vinegar (Balsamic/white/ red) for all blood types.

  • For all type Bs, Worcestershire Sauce is a Tier I Avoid; Vinegar (Balsamic/white/red) is Neutral.

  • Oregano is Neutral for all type ABs.  

  • Wintergreen is Neutral for all type Bs.  

  • Yeast (Bakers) is Neutral for types O, B and AB.  

  • Yeast (Brewers), which should read Yeast (Brewers/ Nutritional) for all types, is Neutral for secretors and Beneficial for nonsecretors.

  • Blackstrap Molasses is a Tier I Beneficial for type AB secretors and nonsecretors, and Neutral for all type Os.

  • For type Os, Club Soda shares the value of Seltzer Water, Beneficial.  


  • On the second page of acknowledgements, the company's name should read "The Republic of Tea."

  • Page 106 contains references to "ODC."  This is "ornithine decarboxylase," an enzyme involved in the production of polyamines. 

  • On p. 209, type A vegetables: it says 1 cup, cooked or " dry;" it should say "raw."

  • On p. 265 of the type B diet, the lines "Onions are also a powerful friend to Type B. They contain significant amounts of the antioxidant quercetin, a powerful antimutagen," and "Artichoke is quite beneficial to the liver and gallbladder, weak spots for Type B."  were mistakenly transcribed from the type A diet.  Onions are generally Neutral for type B secretors, and Beneficial for type B nonsecretors.  Artichokes are a B-secretor Avoid and a B nonsecretor Neutral.

  • Broad Bean and Fava Bean have also been consolidated, as they are identical in common parlance.  The new listing is Fava (Broad) Bean, and its values are Beneficial for A secretors; Avoid for AB secretors and O nonsecretors; and Neutral for all others.

  • Green/Snap/String Bean is a consolidation of the separate items appearing in LR4YT, and has the values Tier I Beneficial for all As, Neutral for all other types.  The separate values listed in LR should be disregarded in favor of this combined value.

  • Under FRUITS, and under VEGETABLES, the serving frequency should read "per day" rather than "per week" for all types.

  • For type AB, on page 317, Blackberry/blackberry juice is listed as Beneficial  for AB secretors and Neutral for AB nonsecretors. This is backwards; it is NEUTRAL  for AB secretors, BENEFICIAL for AB nonsecretors.

  • Ezekiel Bread is upgraded to Tier I Beneficial for A and B secretors and AB nonsecretors.  

  • Oat/Oat Bran/Oatmeal is listed as Neutral for type A secretors; its status is Tier I Beneficial.  

  • Wheat (Whole Wheat Products) is listed in error as a Tier II Neutral for type A secretors -- its value is Avoid.  

  • Wheat Bread (Sprouted Commercial, Except Essene and Ezekiel) is changed from Beneficial to Neutral for type A secretors and type ABs; and from Neutral to Avoid for type B nonsecretors.  

  • On p. 271 it says "Walnut oil and black currant seed oil are highly beneficial for type B secretors."  This should read "type B nonsecretors."

  • The values for Mustard (Prepared) have been refined for all types based upon four possible preparations:  with wheat and vinegar; with wheat, vinegar-free; wheat-free with vinegar; wheat- and vinegar-free.  


    A secretor

    A non-secretor

    B secretor

    B non-secretor

    AB secretor

    AB non-secretor

    O secretor

    O non-secretor

    Mustard (with vinegar and wheat)









    Mustard (with vinegar, wheat-free)









    Mustard (with wheat, vinegar-free)









    Mustard (wheat-free, vinegar-free)










  • In the type B diet, Salad Dressing should read "Salad Dressing/OK Ingredients" and the item Tamari should read "Tamari (Wheat-free)."

  • Worcestershire Sauce is changed to Avoid for type O secretors.

  • The value of Mustard, Dry in the type A Herb/Spice list has been upgraded to Beneficial for secretors and nonsecretors.  

  • Yeast (Brewers) should read "Yeast (Brewers/Nutritional)."  Its value is changed from Neutral to Beneficial for type AB nonsecretors.

  • The type A listing for Tea (Black Regular) should read Tea (Black Regular/Decaf)


Several items have been removed from the food list:

  • Lox and Herring/Kippers.  These foods may or may not be smoked; and may include varying spices, vinegar, etc. which should be evaluated individually.  The item Herring remains, indicating the fresh fish, as does Salmon

  • Mollusks, Mint and Malt, due to redundancy.  Several types of mollusks and mints, as well as Barley Malt (to which "Malt" referred) are valued separately.

  • Red Bean, as it is a term commonly applied to several different kinds of beans.  


  • Invert Sugar values are Neutral for type A secretors, and Tier I Avoid for all other types.

  • Avocado Oil: is Neutral for type A.  Note: since avocado can be problematic for the other blood groups, they should consider this item a Tier I Avoid, no different from avocado. Until further elaboration, this Avoid status should be observed by group O nonsecretors as well.

  • Lecithin is not given a specific value in LR4YT.  It is Neutral for all types.  For type Bs, egg lecithin is slightly preferred over soy lecithin, but either is OK.

TYPEbase4, a searchable food value database by blood group, now displays all updated values on listed foods.  While further amendments will be few, this Errata and Clarifications Page will serve as our change log, showing any additions or modifications made relative to the food lists in Live Right 4 Your Type.


If you've spotted any other inconsistencies or errors, please Visit the BTD Forums and drop a note on the Live Right For Your Type Forum

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