Health
Health Benefits of Kiwi
Chelsea Rae Bourgeois, RDN, LD – December 11, 2023
Medically reviewed by Simone Harounian, MS
Kiwi, once called the Chinese gooseberry, is a small fruit with significant nutritional benefits. Native to the hillsides of Southwest China, kiwi is now a popular fruit grown in many areas of the world. It earned its name from New Zealand fruit exporters, who named it after the flightless kiwi bird based on similarities in appearance.
There are several kiwi species, but the two most commonly consumed are known under the scientific names Actinidia deliciosa and Actinidia chinensis. The Actinidia deliciosa species is the typical green kiwi often seen in stores. However, no matter the type, kiwis offer many evidence-based health benefits. They are rich in vitamin C and can support digestive, heart, and eye health, among other health benefits.
Supports Digestive Health
Kiwis contain soluble and insoluble fiber, supporting health on many levels, starting in the digestive system. Soluble fiber supports a healthy gut microbiome, while insoluble fiber helps maintain regular bowel movements. Research has shown that the fiber found in kiwis can influence stool consistency and transit time through its water-retaining capabilities, more than fiber in other fruits.
These digestive benefits can help those experiencing constipation find relief by adding bulk to stool and decreasing the time it spends in the digestive tract. Furthermore, a healthy gut microbiome can support many health goals. Research continues to point to its profound implications in health concerns, such as diabetes, irritable bowel syndrome (IBS), cardiovascular disease, and depression.
Excellent Source of Vitamin C
Kiwi is an excellent source of vitamin C, a powerful antioxidant essential to a healthy immune system. Vitamin C helps protect the body from oxidative damage caused by free radicals, which are molecules or fragments of molecules with at least one set of unpaired electrons. The oxidative stress triggered by free radicals damages healthy cells and is thought to play a role in a variety of diseases. Just one kiwi provides 64 milligrams (mg) of vitamin C, which is 71% of the recommended intake for men and 85% for women.
Research has shown that eating two kiwis daily for as little as four weeks can improve immune cell function in those with low serum vitamin C. These immune cells, called neutrophils, are white blood cells that help protect the body against infection.
May Benefit Heart Health
A diet rich in fruits and vegetables can help support heart health through several mechanisms, and the kiwi can be a contributing benefactor. For example, a study that examined kiwi intake and blood pressure found that participants who ate three kiwis daily experienced lower blood pressure than those who ate other fruits. Besides regular exercise, adding kiwi to a well-balanced diet can help maintain healthy blood pressure levels.
Kiwi may also positively affect cholesterol. Research has shown a link between daily kiwi consumption and reduced total cholesterol and triglycerides. The study even connected kiwis with improved HDL cholesterol, the healthy cholesterol.
Supports Weight Management
Kiwis can be a nutritious addition to a well-balanced diet, especially for those aiming to lose weight. They’re deliciously sweet but low in calories, meaning they can satisfy cravings without adding excessive energy intake.
Kiwis also contain dietary fiber, which adds bulk to the diet without skewing calorie intake. Plus, fiber contributes to feelings of fullness, which can help prevent overeating. For reference, one kiwi provides around 42 calories and 2 g of fiber.
Still, it’s important to remember that sustainable weight management relies on a well-balanced diet of fruits, vegetables, lean proteins, whole grains, and healthy fats. Kiwis should be consumed mindfully with individualized nutrition needs in mind.
May Improve Eye Health
Interestingly, kiwis may also benefit eye health. Their impressive nutrient profile can help maintain optimal vision and reduce the risk of age-related eye concerns, such as macular degeneration and cataracts. The lutein and zeaxanthin carotenoids found in kiwis can help reduce oxidation in the eye, which can ultimately lead to cataracts. Compared to other sources of carotenoids, kiwis offered a high bioavailability.
The vitamin C found in kiwis also plays a role in eye health and eye structure. As an antioxidant, it may help reduce inflammation and the resulting risk of common eye problems like macular degeneration. However, further research is needed better to understand the relationship between vitamin C and eye health.
While there is a need for a deeper understanding of kiwi and its role in the eyes, regular kiwi consumption may benefit those who want to be proactive with their eye health.
Low-Glycemic Index
Carbohydrates are essential to a healthy diet, but not all carbs are created equal. Some provide more nutritional value, while others cause significant blood sugar spikes. The glycemic index ranks carbohydrate-containing foods based on their effects on blood sugar levels. Foods are ranked on a scale from 0 to 100 based on how quickly they raise your blood glucose. The faster their effects, the higher their rank.
Kiwis have a high water content and are considered a low-glycemic index food. The green kiwi varieties have a glycemic index of around 39, and the golden types around 48. Because of its limited effects on blood sugar levels compared to other fruits, the kiwi may be a good choice for those with diabetes.
Nutrition of Kiwi
One kiwi with a 2-inch diameter, or approximately 69 g of the flesh of a raw green kiwi, provides:
- Calories: 42.1
- Fat: 0.36 g
- Sodium: 2.07 milligrams (mg)
- Carbohydrates: 10.1 g
- Fiber: 2.07 g
- Added sugars: 0 g
- Protein: 0.79 g
- Vitamin C: 64 mg
- Vitamin K: 27.8 micrograms (mcg)
- Copper: 0.09 mg
The kiwi is a powerhouse fruit, rich in many essential vitamins and minerals. One kiwi provides 10 g of carbs, supplying a boost of energy without causing a rollercoaster of blood sugar levels.
Kiwis are also rich in vitamin C, a potent nutrient for the immune system, and vitamin K, essential for blood clotting and bone health. Lastly, kiwis contain approximately 10% of the recommended daily intake of copper. The body uses copper to carry out many vital functions, including making energy, blood vessels, and connective tissue.
Risks of Kiwi
Kiwis are considered generally safe for the average healthy individual. However, they pose a significant risk for those who have a kiwifruit allergy. Kiwis contain many allergens, including actinidin, a major allergen.
Signs of a kiwi allergy include:
- Abdominal pain
- Vomiting
- Wheezing
- Difficulty swallowing
- Generalized hives
- Itchy throat and mouth
- Facial swelling
Tips for Consuming Kiwi
The kiwi is a nutritious fruit that offers many health benefits in addition to its delicious flavor. Consider these tips for consuming kiwi:
- To quickly peel a kiwi, cut it in half and scoop the flesh out with a spoon.
- The peel can be eaten for an additional boost of fiber.
- Once ripe, a kiwi should be refrigerated until eaten.
- Kiwi can be found with green or golden flesh.
- Combine kiwi chunks with mango, peppers, and cilantro to make a zesty salsa.
- Layer kiwi slices with Greek yogurt and low-fat granola to make a nutrient-dense breakfast parfait.
- Add kiwi slices to various smoothie recipes to add vitamin C and copper to a nutritious snack.
A Quick Review
Kiwi is a powerhouse fruit, rich in flavor and nutrients. Despite its small size, it provides a significant amount of the recommended daily intake of many vitamins and minerals. Kiwis are rich in vitamin C, copper, and vitamin K and contain smaller portions of many other important nutrients. Their impressive nutrition profile supports many avenues of health, including digestion, weight management, and blood sugar control. They also support heart and eye health and a healthy immune system.
Kiwis are generally considered safe, except for those with a known allergy to the fruit or any of its components. A registered dietitian nutritionist can help you incorporate kiwi and other nutritious fruits into a well-balanced diet to help meet your health and wellness goals.
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