Clarifications and Errata
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Please explain the two-tier system in Live Right 4 Your Type.
The logic behind the 'two-tier' system is to allow for both a very simplified, less stringent method of following the diet (for example in individuals who only know their ABO status and wish to follow the diet loosely) and a more in-depth method (for individuals who also know their secretor status, or need more detailed information).
Tier One is the basis of the diet for everyone.
If you simply wish to maintain and enhance your current level of health, use only Tier One as your basis of beneficials and avoids, and simply add the tier two foods to your neutral category. You'll be doing the 'most important' beneficials and avoids. You can consider this version the 'Blood Type Diet Lite' as it is easy to follow and only requires that you know your ABO type.
If you are a secretor, or want to do the 'full diet' but only know you ABO type, you add the tier two values to your plan. Tier Two avoids and beneficial 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. This is the "turbo" version of the diet, designed to speed healing and provide added protection against disease.
If you are doing the non-secretor version of your ABO plan, you are automatically doing the tier two values, so relax!
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.