In a small experiment, researchers said that people's decision-making was often influenced by the amount of carbohydrates and protein contained in their breakfast. Participants were more likely to reject an unfair offer if they'd filled up on carbs that morning.

See the source article by following the link below:
In a small experiment, researchers said that people's decision-making was often influenced by the amount of carbohydrates and protein contained in their breakfast. Participants were more likely to reject an unfair offer if they'd filled up on carbs that morning.