Children who consume a lot of fast food will grow up to have lower IQs that those who follow healthy eating patterns.
This is according to a study carried out by an academic at Goldsmiths, University of London and it highlights how important nutrition is to young children.
Dr Sophie von Stumm analysed data from 4,000 Scottish youngsters aged between three and five years old.
After looking at what the daily main meal for these kids was, Dr von Stumm concluded that childhood nutrition had longstanding effects on a person's IQ.
"It's common sense that the type of food we eat will affect brain development, but previous research has only looked at the effects of specific food groups on children's IQ, rather than at generic types of meals," she added.
Dr von Stumm stated that a campaign should now be launched to discourage children from eating fast food.
The expert also said more focus should be placed on the freshness and quality of food being offered to youngsters, rather than merely trying to make sure they are full.