There are many theories on the links between food and sex, but Japanese researchers have come up with a new finding - young people who skip breakfast tend to lose their virginity earlier.
In a study of 3,000 people, those who did not regularly eat breakfast when in their early teens said they lost their virginity at an average age of 17.5, versus an overall average of age 19 for all Japanese.
For those who had a morning meal when they were younger, the average age of having the first sexual experience was 19.4.
The study, backed by Japan's health ministry, was aimed at finding ways to curb unwanted pregnancies. It concluded that a stable home life discouraged early sex.
"Those unhappy with their parents - such as for not preparing breakfast - may tend to find a way to release their frustration by having sex," said Kunio Kitamura, head of the Japan Family Planning Association who led the research.
"If children don't feel comfortable in their family environment, they tend to go out," he told AFP.
Additionally, young people who start having sex early tend to miss breakfast because they return home late, he said.
Japan has one of the world's lowest birthrates as more young people put off starting families, finding them a burden on their careers or lifestyles.
The survey also found that nearly 40 percent of married couples had not had sex in more than a month.
Respondents said they were too tired because of work or found sex to be a pain, according to the study.