Like the study I referenced above, another from New Zealand has tied a higher produce intake to mood. In the study, nearly 300 young adults completed daily food diaries for three consecutive weeks, along with psychological and mood-related ratings. Scientists found that a higher intake of fruits and veggies resulted in more energy, calm, and greater feelings of overall happiness. They also noted that the effects were seen not only on the days more produce was consumed, but also throughout the following day