Is Anorexia Inherited?
Well, as a bald question that of course is silly. Anorexia (by ten to one something that women suffer from) itself leads to infertility so of course it can’t be directly inheritable. However, there are other forms of inheritance, and there’s one in particular that has only in recent decades begun to get the attention it deserves: what happens in the womb.
Strictly speaking of course we shouldn’t call this “inheritance”, because if we do we’re going to get all caught up in genes and Darwin and that’s not what we mean. But we also shouldn’t really call it an environmental influence, because then we’ll get all caught up with pollution scares and the like. Now there are such environmental/pollution factors upon development in the womb, alcohol and thalidomide being perhaps the two most famous. But we’re not talking about that either: rather, upon the influence of naturally occuring hormones on future development. Take this:
“Sex hormones in the womb could be a cause of the eating disorder anorexia, a study has found. The suspicion is that oestrogen may be overproduced by some mothers, affecting the baby’s brain and making it susceptible to the eating disorder.
Psychiatrists investigating the cause of the illness did so by studying records of thousands of Swedish twins, held in a database. They found, not unexpectedly, that the risk of developing anorexia was higher in girl twins than in boy twins. Anorexia is far commoner in girls than in boys.
But an exception to the pattern arose in the case of twins of different sexes. Boys who shared the womb with girl twins were found to be ten times more likely to develop the disorder in later life.”
The thing that interests me here is that the same method is posited as an explanation for the male and female brain types which are discussed in our EQSQ personality tests up at the top there. Except that it’s not oestrogen, one of the female sex hormones, which is thought to be responsible, rather the male one, testosterone.
There’s also a much larger point to be made: that the old nature v. nuture debate really is two bald men fighting over a comb. No, we’re not exclusively the product of our genes, nor are we entirely molded by our society or environment. Genes give us capabilities to be sure, and our environment can prompt the expression or not of them. But most important of all to this story is that our environment is not just society, it’s also the whole development process, including that in the womb.
