Acute effects of fresh versus dried Hayward green kiwifruit on sleep quality, mood, and sleep-related urinary metabolites in healthy young men with good and poor sleep quality

• Published in: Frontiers in nutrition (Lausanne) 2023-03, Vol.10, p.1079609-1079609
• Main Authors: Kanon, Alexander P, Giezenaar, Caroline, Roy, Nicole C, McNabb, Warren C, Henare, Sharon J
• Format: Article
• Language: English
• Subjects: alertness; kiwifruit; melatonin (6-sulfatoxymelatonin); mood; Nutrition; serotonin; sleep
• ISSN: 2296-861X; 2296-861X
• DOI: 10.3389/fnut.2023.1079609

Daily kiwifruit (KF) consumption has been associated with improved sleep quality, but underlying physiological mechanisms are unknown. This study examined acute effects of fresh and dried green KF, compared with a water control, on sleep quality, mood, and urinary serotonin and melatonin metabolite concentrations. 24 men (age: 29 ± 1 years, body mass index: 24 ± 1 kg/m ) with poor ( = 12) or good ( = 12) sleep quality participated in a randomized, single-blind crossover study. One of three treatments was consumed with a standardized evening meal; (1) the flesh of two fresh green KF, (2) dried green KF powder (including skin; equivalent to dry matter of two fresh KF) mixed with water, or (3) a water control, in their own home. Subjective and objective sleep quality, mood, waking urinary 5-hydroxyindoleacetic acid (5-HIAA), 6-sulfatoxymelatonin (aMT6s), vitamin C and B-vitamin concentrations were determined. Regardless of sleep quality group, compared to control, morning sleepiness, alertness upon awakening, and vigor were improved (