Mom’s pills might turn
daughters into lesbians, study suggests
Scientists
say more research needed
Posted Dec. 14, 2004
Special to World Science
Pregnant
womens’ use of certain diet and thyroid medications may lead their daughters
to become lesbians, new findings suggest.
Researchers
said the findings are very preliminary and need confirmation. But if borne out,
the findings could put a new perspective on the hotly debated causes of
homosexuality.
The
researchers, Lee Ellis and Jill Hellberg of Minot State University, North
Dakota, questioned more than 5,000 U.S. and Canadian women in an effort to
determine the effects of drugs they had taken during pregnancy. They found
certain types of pills were associated with a much higher rate of lesbianism
among the women’s daughters – although not with higher rates of
homosexuality among their sons.
The
pills statistically associated with lesbianism included amphetamine-based diet
pills and synthetic thyroid medications, primarily Synthroid and Thyroxine, used
to treat disorders of the thyroid gland.
Mothers
who had taken the diet pills were eight times more likely than other mothers to
have homosexual daughters, whereas those who had taken the thyroid pills were
five times more likely, the researchers found.
The
study also found a third type of drug statistically associated with lesbianism
in the daughters: DES, a drug prescribed to millions of pregnant women between
the 1940s through the early 1970s, especially for those with histories of
miscarriages. DES later fell out of use after research linked it with
reproductive system cancers among daughters and sons.
According
to the researchers, the findings provide partial support for a theory on the
causes of homosexuality that has gained increasing currency among scientists in
the past several years, the neurohormonal theory. This theory, of which Ellis
was one of the original proponents, claims a person’s sexual preference is
influenced by the levels of sex hormones to which he or she is exposed in the
fetus.
But
Ellis and Hellman acknowledged the findings weren’t completely in line with
that theory. The two types of drugs which they found were most strongly
associated with daughters’ same-sex attraction – the diet and thyroid pills
– aren’t known to affect sex hormone levels. Rather, they affect the immune
system.
The
neurohormonal theory also says immune system factors can affect sexual
preference; the placenta, a structure which supports the developing fetus, is
highly immunologically active. But this is a less central aspect of the theory
than its assertions dealing with sex hormones.
“Overall,
it may be hypothesized that drugs affecting the immune system that are being
consumed by the mother during pregnancy could alter brain development of the
fetus in ways that affect later preferences for sex partners,” wrote Ellis and
Hellman in a paper on their findings, to be published in the January issue of
the research journal Personality and Individual Differences.
“Nevertheless,
because there are neither animal experiments nor prior human studies to suggest
that either amphetamines or thyroid drugs are capable of making such
alterations, much more evidence is needed to consider this a well-supported
hypothesis.”
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