This fruit improves mood in just four days, and it's scientific - voila! health. A healthy diet rich in fruits and vegetables has been linked to improved mental well-being.

Vitamin C helps in the synthesis of neurotransmitters and peptide hormones and catalyzes several enzymes that are essential for maintaining healthy brain function, including mood. The results of the study showed that kiwi supplementation improved vitality and mood within four days. The benefits peaked around 14 to 16 days, according to the researchers.