Eating kiwi for four days improves vitality and mood. Vitamin C is involved in the synthesis of neurotransmitters and peptide hormones.

It acts as a catalyst for many enzymes, all of which are required to maintain and enhance healthy brain functioning, including mood. Kiwifruit is an excellent source of vitamin C, which has shown a dose-dependent reduction in depression and overall mood disturbance in youth who consume low levels of fruits and vegetables. The study was conducted by researchers led by Professor Tamlyn Conner from the University of Otago.