Insights & Discussion
The consumption of kiwifruit with a meal can increase the rate and extent of the hydrolysis of protein.
This in vitro study has shown that in elevated gastric pH conditions, such as may present with compromised gastric function, the addition of kiwifruit protease more than doubled the rate of hydrolysis of meat protein. This novel finding supports the hypothesis that consumption of kiwifruit with a meal can increase the rate and extent of the hydrolysis of protein.
Evidence is also provided that when the added acid concentration decreased from 0.074 M to 0.022 M (HCl), pepsin activity reduced by 50% and kiwifruit activity increased by 300%.
This evidence indicates that kiwifruit may exert its influence on digestion by increasing the extent of protein digestion in the gastric medium when the secretion of pepsin and/or hydrochloric acid is less than optimal. It is reported [12] in a study of 365 healthy subjects, average fasting gastric pH was 2.16 ± 0.11 for men and 2.79 ± 0.18 for women, but in another study of 79 healthy elderly people [13], 11% of the participants recorded fasting gastric pH > 5.0 throughout the study.
Discover Related Insights
Fruits, especially kiwifruits, and rye bread can enhance bowel movements and help manage chronic constipation better than conventional dietary methods.
2023 Alimentary Pharmacology & Therapeutics Systematic review and meta‐analysis: Foods, drinks and diets and their effect on chronic constipation in adults Van Der Schoot A, Katsirma Z, Whelan K, Dimidi E
Review Article Constipation Fruits Kiwifruit
An exhaustive analysis was conducted incorporating a multitude of studies, including randomized controlled trials and uncontrolled trials, identified through electronic databases till 12th July 2023. The effect of various foods, drinks, and diets on characteristics such as stool output, gut transit time, symptoms, quality of life, adverse events, and compliance in adults with chronic constipation was inspected. The study also examined the response to different treatments and included a variety of foods such as kiwifruit, high-mineral water, prunes, rye bread, mango, fig, cereal, oat bran, yoghurt, water supplementation, prune juice, and high-fibre or no-fibre diets.
The synthesized data revealed that the consumption of fruits, particularly kiwifruits, and rye bread led to a higher stool frequency when compared to standard treatments like psyllium or white bread. High-mineral water also proved more effective regarding response to treatment than low-mineral water. On the other hand, no distinctive difference was identified for prunes when set against psyllium as a treatment option. Overall, the study insightfully suggests dietary modifications as a means to manage chronic constipation, emphasizing the potential of fruits such as kiwifruits and rye bread.
Gold kiwifruit extracts contained different bioactive materials which showed selective cytotoxic activity against human oral tumor cells and displayed anti-HIV, antioxidant, and antibacterial activities.
2023 Journal of Ethnopharmacology Cancer prevention and therapy with kiwifruit in Chinese folklore medicine: a study of kiwifruit extracts Motohashi N, Shirataki Y, Kawase M, Tani S, Sakagami H, Satoh K, et al.
Network Pharmacology Antibacterial Antioxidant Kiwifruit
The methodology involved stepwise extraction of gold kiwifruit with hexane, acetone, methanol, and 70% methanol; the extracts were then fractionated using silica gel and ODS column chromatographies to examine their biological activities. Different fractions like H1, H2 (from the hexane extract), A1, A2 (from the acetone extract), and M2 (from the methanol extract) were tested, as well as more hydrophilic fractions from the 70% methanol extract.
In the discussion of the results, fractions H1, H2, A1, A2 and M2 displayed notable cytotoxic activity against human oral tumor cell lines, with these showing more sensitivity compared to human gingival fibroblasts. The hydrophilic fractions from the 70% methanol extract demonstrated higher anti-HIV activity, radical generation, and oxygen scavenging activity. However, the antibacterial activity of these fractions was generally lower than that of the more lipophilic (hexane, acetone, methanol) extracts, indicating no distinct antimicrobial action. Interestingly, all fractions were inactive against Helicobacter pylori.
Kiwifruit polysaccharides may alleviate the toxic effects of acrylamide by improving gut health and enhancing bile acid metabolism.
2023 Frontiers in Nutrition Effects of kiwi fruit (Actinidia chinensis) polysaccharides on metabolites and gut microbiota of acrylamide-induced mice Chen M, Chen X, Wang K, Cai L, Liu N, Zhou D, et al.
Animal Study Kiwifruit
In this study, the team explored the potential protective effects of kiwifruit polysaccharides on disorders induced by acrylamide (a toxic ingredient found in high-temperature, carbohydrate-rich food) on gut microbiota and systemic metabolism. They measured changes in gut microbiota and serum metabolites in mice subjected to acrylamide-induced toxicity, focusing primarily on the effects on mice's bodily features, liver health, and liver enzyme activity.
The results revealed that treatment with kiwifruit polysaccharides not only improved the mice's overall health and liver function but also restored the balance in their gut microbiota by increasing microbial diversity and the abundance of beneficial bacteria. Furthermore, it was found that the polysaccharides had a significant impact on amino and bile acid-related metabolic pathways, proving their potential in protecting against toxicity. A strong correlation was also found between certain bacteria and the critical metabolites of bile acid metabolism, providing a deeper understanding of the protective mechanisms of kiwifruit polysaccharides.
Consuming two medium-sized green kiwifruits an hour before bed can improve sleep quality and recovery stress balance among elite athletes.
2023 Nutrients The Impact of Kiwifruit Consumption on the Sleep and Recovery of Elite Athletes Doherty R, Madigan S, Nevill A, Warrington G, Ellis JG
Clinical Study Exercise Performance Kiwifruit Sleep
The study began with an initial assessment, after which all participants were instructed to consume two medium-sized green kiwifruits an hour before bedtime over a 4-week span. Data was collected through baseline and post-intervention questionnaires, as well as daily sleep diary entries throughout the study duration.
There was a notable positive effect of kiwifruit consumption on essential aspects of sleep and recovery in professional athletes. After the intervention period, improvements were observed in sleep quality and recovery stress balances. Additionally, there was an increase in total sleep time, sleep efficiency, and a decrease in the number of times participants woke after falling asleep. The study concludes that kiwifruits positively influence sleep and recovery in high-performing athletes.
Consumption of fresh or dried kiwifruit in the evening improves aspects of sleep quality and mood, potentially mediated through changes in serotonin metabolism.
2023 Frontiers in Nutrition 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 Kanon AP, Giezenaar C, Roy NC, McNabb WC, Henare SJ
Randomised Controlled Trial Kiwifruit Serotonin
A randomized, single-blind crossover study involving 24 men with varying sleep quality levels was conducted. Participants were provided with one of three treatments during their standard evening meal at home: the flesh of two fresh green kiwifruits, dried green kiwifruit powder (with skin and equivalent to the dry matter of two fresh kiwifruits) mixed with water, or a water control. Various factors were evaluated including subjective and objective sleep quality, mood, and urine concentration of several compounds including the serotonin metabolite 5-HIAA, vitamin C, and B-vitamins.
Findings indicated that regardless of sleep quality group, dried kiwifruit consumption was associated with an improvement in morning sleepiness, alertness upon waking, and vigor as compared to the control. Both fresh and dried kiwifruit treatments suggested an improvement in self-esteem and overall mood disturbance. Increase in the urinary concentration of serotonin metabolite was observed with both kiwifruit treatments. Amongst poor sleepers, ease of awakening was notably improved after the intake of dried kiwifruit and showed signs of improvement with fresh kiwifruit. For good sleepers, there seemed to be an improvement in getting to sleep with fresh kiwifruit. Poor sleepers were found to have lower quantities of certain B-vitamins compared to good sleepers. Thus, both dried and fresh kiwifruit consumption with a standard evening meal showed a positive impact on sleep quality and mood.
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