While both foods may have long been associated with a range of health benefits, new research carried out by a team of scientists in the United States is the first to specifically look at the benefits derived from choline, a nutrient belonging to the vitamin B family.
According to the Boston University team, their studies have shown that people who consume plenty of choline tend to perform better in memory tests than those who don't get much of it in their diets.
Furthermore, the nutrient, which is found in foods such as chicken and eggs, was also found to reduce the risk of developing a range of mental health conditions, including dementia.
Writing up the findings, study leader Dr Rhoda Run advised people to look at enjoying a healthy all-round lifestyle rather than looking for one magic ingredient that will keep them both mentally and physically healthy into their old age.
"I think the message is that eating a healthy, balanced diet in mid-life is important," she concluded.
This comes as the City of Edinburgh Council has launched a scheme that will give dementia sufferers GPS technology to help them if they get lost or confused.