Whether an expectant mother gives birth to a boy or girl may in part be due to what and how much she eats during the time of conception, a new report says.

The study published in the journal, Proceedings of the Royal Society B: Biological Sciences reports a link between higher energy intake around the time of conception and increased chances of having a boy.

“The difference is not huge,” the New York Times reports, “but it may be enough to help explain the falling birthrate of boys in industrialized countries, including the United States and Britain.”

High levels of glucose appear to better support the growth of male embryos rather than female embryos. So next time you pre-conception mothers think of skipping breakfast, which shrinks glucose levels, remember that it may mean you’re more likely to have a baby girl.