Kiwi Fruit

Generic name: Actinidia Chinensis Planch.
Brand names: China Gooseberry, Chinese Gooseberry, Kiwi Fruit, Kiwi Fruit Extract, Kiwifruit, Tara Fig, Tengligen

Usage of Kiwi Fruit

Anti-inflammatory activity

Animal data

Anti-inflammatory activity of A. chinensis has been demonstrated in vivo in mouse models. Anti-inflammatory potential of A. chinensis seeds mainly depends on the synergetic effect of polyphenols; a potential preventive role in a variety of inflammation-related diseases has been suggested.(He 2019)

Antimicrobial activity

In vitro data

In vitro experiments using skin, pulp, seed, and stem extracts showed bactericidal activity against Staphylococcus aureus, Streptococcus pyogenes, Streptococcus faecalis, Salmonella typhi, Proteus mirabilis, Pseudomonas aeruginosa, Escherichia coli, and Klebsiella pneumonia. Polyphenols from the seeds of A. chinensis showed significant bactericidal activity against Bacillus cereus, B. subtilis, Shigella flexneri, and S. typhi and were bacteriostatic against Bacillus thuringiensis.(He 2019)

A thaumatin-like antifungal protein isolated from kiwi fruit showed modest activity against Botrytis cinerea and weaker inhibitory activity against Mycosphaerella arachidicola, Coprinus comatus, and Physalospora piricola.(Wang 2002)

Antioxidant activity

In vitro and in vivo data

In a study evaluating total antioxidant and ascorbic acid content of various commonly consumed fruits and vegetables, kiwi fruit was found to have the highest concentration of ascorbic acid as well as strong antioxidant activity.(Szeto 2002) A study comparing the carotenoid content of a variety of foods showed a higher proportion of lutein and zeaxanthin (the major carotenoids found in the human eye) in kiwi fruit than in spinach.(Sommerburg 1998) In vitro and in vivo studies have shown antioxidant activity of kiwi fruit.(Iwasawa 2011, Karlsen 2011) Assays based on superoxide dismutase, glutathione, ALT, AST, oxidative DNA damage, and lipid oxidation have confirmed that A. chinensis possesses antioxidant capacity. Appropriate extraction methods, genotypes, and plant parts can be screened to maximize the antioxidant properties of A. chinensis.(He 2019)

Cancer

A critical literature review investigated 8 published studies (5 in vitro studies, 2 human intervention trials, 1 in vivo study, and 1 in-human study). Results suggest that kiwifruit supplementation may be associated with direct and indirect anticancer effects. Direct effects are likely due to ascorbic acid−mediated reduction of DNA oxidative injury and cytotoxic effects on cancer cell lines, while indirect effects are more likely attributable to enhanced daily bowel movements and increased intestinal fecal content of lactic acid bacteria, which would ultimately contribute to lowered risk of malignancies, especially colorectal cancer.(Lippi 2020)

In vitro data

Kiwi plant roots are used in traditional Chinese medicine and contain triterpenoids that have weak inhibitory effects against growth of several human cancer cell lines in vitro.(Xu 2010) A. chinensis root extracts have attenuated proliferation and metastasis of hepatocellular carcinoma cell lines by inhibiting epithelial-mesenchymal transition.(Fang 2019) A. chinensis has also prevented the proliferation and migration of gastric cancer cell lines associated with apoptosis, ferroptosis activation, and mesenchymal phenotype suppression.(Gao 2020) Further in vitro experiments demonstrated that the root of A. chinensis inhibits hepatocellular carcinoma cells through Laminin subunit beta-3.(Hou 2018)

Cholesterol-lowering activity

Animal data

Studies in hypercholesterolemic mice fed preparations containing kiwi fruit and hawthorn have shown positive results.(Xu 2009)

Clinical data

Among healthy volunteers in a randomized crossover study, 28 days of kiwi fruit consumption reduced platelet aggregation (P<0.05) and plasma triglyceride levels (P<0.05) compared with controls. No effects on HDL or LDL cholesterol were observed.(Duttaroy 2004, Skinner 2011)

GI effects

Clinical data

The fiber content of kiwi fruit is suggested to be approximately 3.5 g per 100 g of fruit.(Chan 2007, Duke 2002) A small, unblinded clinical trial evaluated the effect of kiwi fruit on colon transit time and defecation frequency in healthy adults and in those with irritable bowel syndrome. Improved bowel function with kiwi fruit consumption compared with placebo was observed.(Chang 2010) Further small studies support anecdotal reports of the laxative effects of kiwi fruit.(Chan 2007, Rush 2002) In a randomized controlled crossover trial in mildly constipated adults (N=32), daily consumption of 3 gold-fleshed kiwifruit was associated with a significant increase of 2 complete spontaneous bowel movements per week and a reduction in GI discomfort. Number of complete spontaneous bowel movements was significantly greater with kiwifruit compared with baseline and comparator treatment (Metamucil) (P<0.05 for both comparisons).(Eady 2019) In a pilot randomized crossover trial in healthy adult men (N=10) examining effects of kiwifruit on satiety and measures of gastric comfort, results suggested that green kiwifruit (containing actinidin) may reduce bloating and other measures of gastric discomfort.(Wallace 2017)

Other studies reporting upper GI effects as secondary outcomes were identified in a systematic review that explored the effects of kiwifruit in healthy participants as well as patients with constipation (ie, functional constipation, IBS). Limitations included variations in study protocols, product form (ie, whole fruit, powder, extracts), study duration (1 to 28 days), controls (ie, prunes, psyllium, glucose, maltodextrin, none), and participant characteristics (ie, healthy versus constipated); study populations ranged from 10 to 184. Overall, sparse evidence reflected positive effects of kiwifruit on upper GI health. Specifically, evidence of benefit was noted for dyspepsia (high quality), abdominal discomfort/pain (good quality), and distention/bloating (good quality) particularly with consumption of 2 or 3 whole kiwifruit per day.(Bayer 2022)

Immune function

Animal data

Effects of kiwi fruit extracts on immune function have been studied in mice.(Edmunds 2012, Lin 2011, Skinner 2011)

Clinical data

Limited preliminary clinical studies suggest that consumption of kiwi fruit may assist in upregulating the immune system.(Skinner 2011) A small study in elderly patients found that kiwi fruit consumption reduced the severity and duration of symptoms associated with upper respiratory tract infections. However, indicators of immune function (natural killer cell activity and phagocytosis) did not differ from those of the comparator banana group.(Hunter 2012)

Kiwi Fruit side effects

Allergy to kiwi fruit and the kiwi vine is well documented. This includes oral allergy syndrome, contact dermatitis, Kounis coronary syndrome, and anaphylaxis. Trace amounts of kiwi fruit have been responsible for some of these reactions.(Gázquez 2010, Guler 2014, Mancuso 2001, Mempel 2003, Rademaker 1996, Shimizu 1995, Veraldi 1990) Although acute pancreatitis in the course of an allergic reaction to a food substance is rare, a case report describes a patient with repeated attacks of acute pancreatitis secondary to kiwi fruit ingestion.(Gastaminza 1998)

Cross-reactivity of kiwi fruit with several other allergens, including birch and meadow fescue grass pollens, latex, avocado, and banana has also been reported.(Alemán 2004, Gavrović-Jankulović 2002, Möller 1998, Voitenko 1997) The major allergen appears to be the proteolytic enzyme actinidin. Industrial heating and homogenizing techniques appear to diminish the likelihood of allergic reactions.(Fiocchi 2004)

Consumption of relatively large quantities of kiwi fruit may result in diarrhea.(Skinner 2011)

Before taking Kiwi Fruit

Kiwi has GRAS status when used as food. Dosages higher than amounts found in foods should be avoided; safety and efficacy have not been established.

How to use Kiwi Fruit

Clinical trials are lacking to inform therapeutic dosing. One kiwi fruit contains approximately 100 mg of vitamin C (approximately the recommended US daily intake).(Szeto 2002)

In humans, the bioavailability of vitamin C from skinless kiwi fruit consumption was equal to that of a synthetic chewable vitamin C tablet.(Carr 2013a, Carr 2013b)

Warnings

Information is lacking. Kiwi has GRAS status when used as food.

What other drugs will affect Kiwi Fruit

None well documented. The serotonin concentration of the fruit is approximately twice that of tomatoes and one-third that of bananas. Therefore, ingestion of kiwi fruit can increase urinary excretion of 5-hydroxyindoleacetic acid and may interfere with laboratory analyses of this serotonin byproduct.(Feldman 1985)

The 90% ethanol extract of A. chinensis root (50 mcg/mL) exhibited inhibitory activities on CYP2C9, CYP2D6, and CYP3A4 in human liver tissue. The inhibitory effect of the crude extract could be largely attributed to the presence of triterpenoids. It should be noted that the combination of crude extracts of these triterpenoids with other medicinal herbs or drugs may lead to drug interactions with CYP enzymes at pharmacokinetic and pharmacodynamic levels; caution is warranted when consuming A. chinensis fruit when taking other herbal or drug products.(He 2019)

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