Serotonin may be why kiwi fruit has a long-running reputation for its sleep-aiding abilities. The serotonin in kiwifruit has been shown to increase sleep time and sleep efficiency by 13 percent and 5 percent, respectively, so if you can’t sleep, kiwi may help.
There is also evidence to suggest serotonin may also helps boost memory and mood and can even help with depression.
Collagen is the most abundant protein in our bodies and the building block that maintains the skin, muscles, bones and tendons. It breaks down as we age and is dependent on vitamin C, which we know kiwifruit has plenty of. According to research published in the Journal of Cellular Physiology, the polysaccharides in kiwifruit are able to double collagen synthesis in the body, compared to normal conditions when this activity reduces as we age.
Kiwi is also host to a carotenoid and antioxidant called lutein, which is incredibly beneficial to skin health by protecting the skin from UV light, marking yet another kiwi nutrition benefit.
The trees in the actinidia family (kiwi trees) have been used as medicinal plants in China for many years, treating ailments like joint pain, bladder stones, and cancers of the liver and esophagus. Both the fruit and roots of kiwi have proven inhibitory effects on human liver, lung and colon cancer cell growth.
Thanks to polysaccharide content and the abundance of antioxidants found in kiwi nutrition, studies in mice have shown antitumor and reduction of cancer cells. These reasons are why kiwi are among some of the best cancer-fighting foods available in nature.
One kiwi a day can provide a lower risk of stroke, blood clots and cardiovascular diseases. The potassium in kiwifruit helps lower blood pressure, counteract sodium in the body and is a vasodilator, relaxing the blood vessels throughout the body.
The fiber found in kiwi is also very heart-healthy, along with vitamin K, which is able to prevent the buildup of calcium in the arteries and therefore able to reduce the risk for heart attacks.
Studies have shown that people who regularly consume kiwifruit have 15 percent lowered triglyceride levels compared to those who do not. Kiwifruit is also a great source of omega-3s, magnesium, vitamin E and copper, all of which help keep the cardiovascular system working properly.