Scientists from St. Bonaventure University in New York state asked 61 people to draw foods with different levels of fat and sugar to measure their mood and other factors, the Wall Street Journal reported.
The results showed that the mood of the pizza artists improved by 28 percent, ahead of cupcakes at 27 percent and high-sugar strawberries at 22 percent. Those asked to draw peppers saw a positive increase of just one percent.
All the participants were given the same colours and the results were unrelated to their diets, the Wall Street Journal said.
The study was published in the Journal of Behavioral and Brain Science.
Pizza originated in Naples, southern Italy. A Roman-style one was developed, with a thinner base, to rival the traditional Neapolitan pizza.