Is your Personality based on your Blood Group?

Personality Fans of this Blog will know that I am sceptical about theories of personality. I really don’t believe people either have, or need to have, a fixed personality. Nor do I believe that standard personality tests are that accurate. And even if they are accurate at this moment in time they may not be so next year.

You will also know from me that you are better off losing your Ego and your Personality (if you have one) because they limit your possibilities, intensify your bananas, keep you in your comfort zone, and stifle your Personal Genius.

However a Japanese friend of mind asks whether I have heard of the concept of ketsu-eki-gata, in which temperament is said to be influenced by the individual”s blood group. Since there are only 4 groups:  A, O, B and AB it would seem that there are four basic types – as shown in the table below (click on it to enlarge):


She goes on to say:

If this idea has some truth in it then in we have more evidence that Bodymind – working through the blood-group – has an influence on our preferences, our moods, the way we express emotions, our behaviors, our attitude towards other people, and our career choices.’

It could be that she has a point if we consider that blood group types might influence temperament (emotional make-up) rather than personality. But nobody has yet been able to show whether there is a link, and how it works, although theories like this are at least 2500 years old.

She tells me that in Japan and Korea, blood groups are widely used by dating agencies to match people up, and by employers in order to assess whether applicants are ‘right’ for the job.

Apparently my own blood group – B – has a bad reputation in Korea and Japan as we are widely viewed as mad, bad, and dangerous to know.

A few years ago Dr Peter D’Adamo published a book in which he argued that people could more easily lose weight by following the right diet for their blood type. So Blood Group O should avoid wheat and dairy; Group A should follow a mostly vegetarian diet; Group AB the same as A, but with occasional meat and fish; while Group B should avoid nuts (one of my favorites!) and processed foods like white bread. If this is the case (and this is still a controversial theory) then it suggests that blood groups can influence taste as well as metabolism. So why not temperament?

I ran the description of the ‘B’ personality past my wife and a few friends and they all agree that it is fairly accurate of me. That doesn’t make it true though!

What do you think? Do you – and those close to you – believe that these descriptions fit you?

And – for you readers who know me personally – do you think that Type B is accurate?

I promise to publish all replies – appreciative or sceptical, and flattering or non-flattering!

2 thoughts on “Is your Personality based on your Blood Group?

  1. Peter B. P. May 12, 2010 / 10:58 am

    How about those who are type AB?
    This doesn’t hold water, less than the ‘diet based on your blood type’ stuff a few years back.
    On the other hand, its a great ice-breaker at parties when people ask you what your blood-cum-personality type is: “I’m a zero”.


  2. Mark McGuinness May 25, 2010 / 1:39 pm

    A Japanese person of my acquaintance finds it amazing that I don’t know my own blood type. It seems this is essential information, like knowing your own date of birth, height and weight.
    Whether or not there’s a genuine physiological influence on temperament, could this theory become to some extent a self-fulfilling prophecy? i.e. if everyone around you see you as a type ‘B’ person and treats you that way, particularly as a child, maybe it has an influence on your self-image and behaviour.


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