The kiwifruit is the edible berry of a cultivar group of the woody vine Actinidia deliciosa and hybrids between this and other species in the genus Actinidia. The Actinidia is native to China.
The most common cultivars of kiwifruit are oval, about the size of a large hen's egg (5–8 cm / 2–3 in long and 4.5–5.5 cm / 1¾–2 in diameter). It has a fibrous, dull brown-green skin and bright green or golden flesh with rows of small, black, edible seeds. The fruit has a soft texture and a unique flavour, and today is a commercial crop in several countries.
Also known as the Chinese Gooseberry[1], the fruit was renamed for export marketing reasons in the 1950s; briefly to melonette, and then by New Zealand exporters to kiwifruit. This latter name comes from the kiwi — a flightless bird and New Zealand's national symbol, and also a colloquial name for the New Zealand people.
To avoid confusion with the bird and the people, the fruit is always called "kiwifruit" in New Zealand and Australia. However, in other countries, kiwifruit is often referred to colloquially as "kiwi".
Kiwifruit is a rich source of vitamin C, 1.5 times the DRI scale in the US. Its potassium content by weight is slightly less than that of a banana. It also contains vitamins A and E. The skin is a good source of flavonoid antioxidants. The kiwifruit seed oil contains on average 62% alpha-linolenic acid, an omega-3 fatty acid.[7] Usually a medium size kiwifruit contains about 46 calories[8], 0.3 g fats, 1 g proteins, 11 g carbohydrates, 75 mg vitamins and 2.6 g dietary fiber.
Kiwifruit is often reported to have mild laxative effects, possibly because of the high level of dietary fiber.[9]
Raw kiwifruit is also rich in the protein-dissolving enzyme actinidin, (in the same family of thiol proteases as papain), which is commercially useful as a meat tenderizer but can be an allergen for some individuals. Specifically, people allergic to latex, papayas or pineapples are likely to be allergic to kiwifruit also. The fruit also contains calcium oxalate crystals in the form of raphides. Reactions to these chemicals include sweating, tingling and sore mouth; swelling of the lips, tongue and face; rash; vomiting and abdominal pain; and, in the most severe cases, breathing difficulties, wheezing and collapse. The most common symptoms are unpleasant itching and soreness of the mouth, with the most common severe symptom being wheezing. Severe symptoms are most likely to occur in young children.
This enzyme makes raw kiwifruit unsuitable for use in desserts containing milk or any other dairy products which are not going to be served within hours, because it soon begins to digest milk proteins. This applies to gelatin-based desserts as well, as the actinidin will dissolve the collagen proteins in gelatin very quickly, either liquifying the dessert, or preventing it from solidifying. However, the U.S. Department of Agriculture suggests that cooking the fruit for a few minutes before adding it to the gelatin will overcome this effect.[10] Sliced kiwifruit has long been regularly used as a garnish atop whipped cream New Zealand's national dessert, the pavlova.
Kiwifruit also serves as a natural blood thinner. A recent study performed at the University of Oslo in Norway reveals that--similar to popular mainstream aspirin therapy-consuming two to three kiwifruit daily for 28 days significantly thins the blood, reducing the risk of clots, and lowers fat in the blood that can cause blockages.
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