Scientists have uncovered a way to increase the chances of giving birth to a baby girl - become a vegetarian.
A team from Nottingham University studied the impact of diet of pregnant women on the gender of their child.
They found that while the national average in Britain is 106 boys born to every 100 girls, for vegetarian mothers the ratio was just 85 boys to 100 girls.
Researcher Pauline Hudson told BBC News Online that the findings of the study were statistically significant.
"This was an incidental finding - we had been looking at the impact of diet on baby weight - but it is not something we have published lightly, this was a very well carried out study."
Ms Hudson said the mechanism behind the impact of diet was unclear, but she put forward three possible theories:
a vegetarian diet places stress on the female body, meaning that female foetuses, which are known to be more robust, survive, while male foetuses are killed off
a vegetarian diet changes the acidity of the vaginal secretions, creating a hostile environment for sperm carrying male genetic information
the diet contains chemicals which mimic the action of female sex hormones such as oestrogen
The research was dismissed by Catherine Collins, of the British Dietetic Association, as a "statistical fluke".
Catherine Collins dismissed the findings
She said: "It is actually the male's contribution that determines the sex of the baby.
"It would have been more interesting to look at what the men were eating, rather than what the women were eating."
Ms Collins said the important factor was that both men and women ate a healthy diet to maximise the chances of conception.
The survey was based on an audit of some 6,000 pregnant women in 1998.
The results were published in the Practising Midwife journal.
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