Women who consume a lot of calories when trying for a baby are more likely to give birth to a son, they said. Women who ate around 2,200 calories a day were 1.5 times more likely to have a boy than those who ate less than 1,850 calories a day.
The eating of breakfast cereals before and around the time of conception was also "strongly associated" with women producing sons, the researchers said. They worked out that women eating breakfast cereals were 1.89 times more likely to have a boy than those who did not consume them.