As scientists have found, if the level of the hormone is increased, a person is more likely to choose a small, but instant monetary reward, and not more, but delayed.
This is because ghrelin signals the brain to eat and can influence the brain processes that control the reward system. Ghrelin levels fluctuate throughout the day depending on food intake and individual metabolism.
Scientists conducted a study on 84 young girls. Healthy women with elevated grenaline levels were more likely to choose immediate and small rewards. This, according to scientists, demonstrates the impulsiveness of the choice.