Hello - I'm asking for a very important reaason. I have not persued Dr D'Adamo's books yet but know I am an A+. Contrary to what I know the "healthy" diet and diegestive system of an A is, I cannot possibly eat that way. I have 2 autoimmune disorders - one of which started when I was 21 and was first diagnosed as "bulimia" but is always traceable back to the ingestion of starches, legumes and even milk sugar. The other illness is now very mild hyperthyroidism. I want to know what "blood subtype" is and what role it plays because it sounds very much like my blood subtype is ruling things for many years now as an "O" !!

Hello. Thank you for listing blood subtypes, for me because I am probably winding up as being a "taster" due to hyperthyroidism. It was a very complicated thing to sift through at first.

But please tell me - where in Dr. D'Adamo's writings would ANYTHING come up as to why (I) an A would develop such horrible bulimia leading me to react to grain, legumes, fruit, fructose, milk sugar......forcing me to begin eating as an "O"? If my blood type is supposed to support the very foods I react against.....? I know I cannot turn into an "O" !

read the genotype diet, find out your genotype and secretor status...as well as subtype if you wish
you might be an explorer A having lamb as beneficial
The most recent rating of a food can be found using typebase:

http://www.dadamo.com/typebase4/typeindexer.htm

Read about the non secretor issue
http://www.dadamo.com/knowbase/newbie/a.htm
library
http://www.dadamo.com/books.htm
http://www.4yourtype.com/departments.asp?dept=7
More information on SWAMI diets can be found at:


http://www.dadamo.com/clinic/swamigenotype.htm

Are you 100% positive that you're an A? More than one person has followed the wrong BTD before finding out that their blood type is other than what they thought it was.

You may be able to digest more grains and beans after doing some serious healing- perhaps you will be able to digest grains and beans once your gut is in better shape. Lactose intolerance is normal for As, and any dairy products you'd be likely to get (on the blood type diet or genotype diet) would be yogurt and cheeses that are naturally low in lactose.

It's also possible that you're an Explorer, and simply need much more meat and far fewer starches than the "Typical A."

With all your health problems, I would suggest that you either go with GTD or go right to SWAMI.

I am A and do a mostly paleoized version of the explorer diet, which is what i ate most of my life anyway.  Fruits and meats.  Of course i ate other stuff like pizza and french fries, breads and stuff like that.  

But i began in college eating a lot of starches, grains, alcohol, coffee, etc and developed bad indigestion problems.  Also started adding mayo, mustard, and sauces to foods, which i never did before college cuz i didn't like them.

Now i try to keep it more like i ate back when i was younger and do better.  Sauces, fats, and some oils give me bad indigestion.

Thank you very much, everyone. Hope this bumps up for the "thank-you" but I'm going to buy Genome Type and persue more questions on other threads. I'm fasinated  and hope to lose weight as well, being chronically obsee for the past 10 years. THANKS!

I am interested in this as well, since I am an O, so I assume my dad must have been an O, as my mom, who is still alive is an A.  There are four kids in my birth family, two A's and two O's.

Does this make me an Oa?  I have been pondering this, as I am a hunter who is supposed to eat mostly fish.  I assume it has to do with the heart disease in my family, but I also can't help but wonder about the A influence of my mother.

Can anyone help me understand this?

Quoted Text

Does this make me an Oa?

No. The gene that carries blood type is what is called "diploid" meaning that it has two alleles, humans only have 3 different alleles possible for blood type. The only way you can be an O is if you are an Oo, A will always dominate over O as will B, A and B will battle it out and share dominance.

Quoted from grey rabbit

No. The gene that carries blood type is what is called "diploid" meaning that it has two alleles, humans only have 3 different alleles possible for blood type. The only way you can be an O is if you are an Oo, A will always dominate over O as will B, A and B will battle it out and share dominance.

This is very interesting.  
So my sons are A as I am A but their dad is O does that make them Aa or Ao?  

Quoted from grey rabbit

No. The gene that carries blood type is what is called "diploid" meaning that it has two alleles, humans only have 3 different alleles possible for blood type. The only way you can be an O is if you are an Oo, A will always dominate over O as will B, A and B will battle it out and share dominance.

So how do an A mother and an O father have O children if A is always dominant?  Sorry if I am sounding dumb here, but I just don't get it    This has always perplexed me.

I know my father is my biological father, as I have his rare blood antigen.

Quoted from Patty H

So how do an A mother and an O father have O children if A is always dominant?  Sorry if I am sounding dumb here, but I just don't get it  

The A mother could be either Aa or Ao.
The O father would be Oo.

If the mother is Ao and passes the o to the child, since the father only has o to pass, the child will be O.

The dominance is within the person, but has no decision making capability about which allele is passed to a child...

Quoted from Serenity

This is very interesting.  
So my sons are A as I am A but their dad is O does that make them Aa or Ao?  

The sons MUST be Ao because the only allele the father could pass is o...

I know that I am an Ao because I know that I am an A (of course) and I have a daughter that is an Oo, her father was an Oo. One allele comes from the father and one from the mother, her father could only give her an O and I could have given her an O or an A, I gave her an O so she is Oo. If I were an Aa, I would only have been able to give her an A and she could not have been an O. Also, two Aos could have a child that was an Oo - that is why Os will never disappear!

My mom is an A, and my dad was an O. Does that mean that I'm an Ao?

Quoted from Patty H

So how do an A mother and an O father have O children if A is always dominant?  Sorry if I am sounding dumb here, but I just don't get it    This has always perplexed me.

I know my father is my biological father, as I have his rare blood antigen.

Everyone has two alleles (genes) for ABO blood type, one from each parent. O is a recessive blood type which means you must inherit an O gene from each parent. A and B are dominant to O which means if an offspring inherits an A or B from one parent and an O from the other parent then the offspring will be A or B blood type.

A and B however are codominant to each other. This is why blood type AB exists. Neither the A or B will completely dominate over the other. Hope this makes sense.

Quoted from Drea

My mom is an A, and my dad was an O. Does that mean that I'm an Ao?

Yes, your O dad could only pass on O genes.

Quoted from Captain_Janeway

Yes, your O dad could only pass on O genes.

That's so interesting. I've often found that I do better on a bit more protein than the standard A. Could this be the reason?

Thank you all, for your explanations.  I think I get it now.  So, just to make sure I understand, O's can only be Oo, even if they have an A, B or AB parent, yes?

Quoted from Patty H

Thank you all, for your explanations.  I think I get it now.  So, just to make sure I understand, O's can only be Oo, even if they have an A, B or AB parent, yes?

This is correct.

AA (A) can only give A gene.

Ao (A) can give A gene or o gene.

BB (B) can only give B gene

Bo (B) can give B gene or o gene.

Oo (O) is always O and only gives an o gene.

AB (AB) gives either an A or B gene.


A and B will express over o if an A or B gene is present.  The o remains dormant but able to be passed, so it is a recessive gene.  

The same principle for brown eyes and blue eyes.  Brown are dominant, blue are recessive.  o is a strange recessive because recessives usually are not the most common gene expression and are usually the result of a mutation after a dominant gene already exists.  All of these blood types existed before human beings existed as homo sapien.

Quoted from Easy E

AA (A) can only give A gene.

Ao (A) can give A gene or o gene.

BB (B) can only give B gene

Bo (B) can give B gene or o gene.

Oo (O) is always O and only gives an o gene.

AB (AB) gives either an A or B gene.


A and B will express over o if an A or B gene is present.  The o remains dormant but able to be passed, so it is a recessive gene.  

The same principle for brown eyes and blue eyes.  Brown are dominant, blue are recessive.  o is a strange recessive because recessives usually are not the most common gene expression and are usually the result of a mutation after a dominant gene already exists.  All of these blood types existed before human beings existed as homo sapien.

Excellent!  Thanks for the detailed explanation, Easy E  

Quoted Text

O's can only be Oo, even if they have an A, B or AB parent, yes?

If you are an O you cannot have an AB parent! Eye color is far more complex than blood type BTW, there are only three alleles for blood type and so far there have been 800+ alleles identified that have an influence on eye color! Therefore it is possible for a blue-eyed parent and a brown-eyed parent to have a blue-eyed child even though brown is dominant.

@Drea, I know that I am an Ao, but I do not do well on more meat than an A normally would, I don't think having a recessive o really does that much as far as food choices go.

Thanks grey rabbit. I don't mean "meat", necessarily, but definitely more protein.