Introduction

Kiwi fruit, often called kiwi, is a small, fuzzy fruit with vibrant green flesh and tiny black seeds. It has a sweet-tart taste. Kiwis are packed with vitamins, especially vitamin C, vitamin K, and antioxidants. They also have fibre and other essential nutrients for your body’s health.

Importance of bone health

Keeping your bones strong is important for staying healthy and avoiding injuries. Eating the right food such as calcium-rich foods and fruits like kiwi, can help keep your bones strong and healthy.  Regular exercise helps to keep your bones strong and reduces the risk of problems like fractures.

Nutritional composition of kiwi^1,2

• Vitamin C: kiwi is famously rich in vitamin C, even more so than oranges. This vitamin is essential for a healthy immune system, wound healing, and collagen production, which is important for skin health.
• Vitamin K:  contains a good amount of vitamin K, which plays a crucial role in blood clotting, helping wounds to stop bleeding when you get injured
• Dietary fibre: kiwi is a great source of dietary fibre, which is important for digestive health. Fibre helps to keep your digestive system running smoothly and can also help regulate blood sugar levels and lower cholesterol.
• Potassium: kiwi is relatively high in potassium, an electrolyte that helps regulate fluid balance, nerve signals, and muscle contractions in the body
• Folate: kiwi contains folate, vitamin B, which is important for cell division and the production of DNA and RNA
• Antioxidants: kiwi is rich in antioxidants like flavonoids and carotenoids, which help protect your cells from damage caused by free radicals and oxidative stress.

How does kiwi support bone health? 

• Calcium absorption: kiwi contains a good amount of calcium, a mineral that is crucial for bone strength. But what's more important is that kiwi contains vitamin K, which helps in the absorption of calcium into the bones. This means that the calcium you get from kiwi is more effectively used by your body to build and maintain strong bones³
• Vitamin C for collagen synthesis: kiwi is loaded with vitamin C, which is essential for the synthesis of collagen, a protein that forms the structural framework of bones. Collagen provides the flexibility and strength needed to resist fractures and maintain bone integrity¹
• Antioxidant protection: kiwi is rich in antioxidants like flavonoids and carotenoids, which help reduce oxidative stress in the body. Oxidative stress can lead to inflammation and bone loss, so consuming antioxidant-rich foods like kiwi can help protect bone health.
• Reduced bone resorption: some studies suggest that kiwi may help reduce bone resorption, the process by which old bone tissue is broken down and replaced with new bone. This is thought to be due to the presence of certain bioactive compounds in kiwi that have anti-inflammatory and bone-protective effects³
• Enhanced bone density: some studies suggest that eating kiwi regularly might help keep your bones dense and strong. This means that including kiwi in your diet may help prevent osteoporosis and reduce the risk of fractures, especially as you get older³

Scientific evidence of kiwi’s effectiveness

Clinical trials on kiwi consumption

Clinical trials have looked into how eating kiwi affects bone health. These trials studied things like bone strength, bone cell activity, and the risk of fractures. While the results aren't all the same, many studies found that eating kiwi can make bones stronger and healthier. However, more research is needed to be sure.⁴

Meta-analyses and systematic reviews

Meta-analyses and systematic reviews have also been done. These studies combine information from different trials to get a big picture of how kiwi affects bones. They help us see if there's a consistent pattern in the results. Generally, these reviews suggest that eating kiwi is good for bone health.^{4, 1}

Ways to include kiwi into a bone-healthy diet

1. Fresh fruit salad: dice up some kiwi along with other favourite fruits like strawberries, bananas, and oranges for a refreshing and colourful fruit salad
2. Smoothies: blend kiwi with yoghurt, spinach, and a splash of orange juice for a vibrant green smoothie packed with vitamins and minerals
3. Kiwi salsa: combine diced kiwi with tomatoes, onions, cilantro, and lime juice to create a zesty salsa that pairs perfectly with grilled chicken or fish
4. Tropical fruit skewers: thread chunks of kiwi onto skewers with pineapple, mango, and coconut for a fun and festive dessert or snack
5. Kiwi parfait: layer sliced kiwi with Greek yoghurt and granola for a delicious and nutritious parfait that's perfect for breakfast or as a midday snack
6. Kiwi chia pudding: mix mashed kiwi with chia seeds and almond milk, then let it sit overnight in the fridge for a tasty and filling chia pudding
7. Kiwi smoothie bowl: top a thick kiwi smoothie with sliced kiwi, granola, shredded coconut, and a drizzle of honey for a satisfying and Instagram-worthy breakfast
8. Grilled kiwi: slice kiwi and grill it for a few minutes on each side until it's slightly caramelised. Serve it as a sweet and tangy side dish or dessert.
9. Fruit kabobs: thread kiwi chunks onto skewers with grapes, strawberries, and melon for a fun and colourful snack or appetiser
10. Kiwi jam: cook mashed kiwi with sugar and lemon juice until thickened to create a delicious homemade jam that can be spread on toast or used as a topping for yoghurt or oatmeal

FAQs

How does kiwi help with bone health?

Kiwi contains nutrients like vitamin C, which helps in making collagen for strong bones, and vitamin K, which helps in calcium absorption, making bones stronger.

Can eating kiwi prevent fractures?

While there's no guarantee, studies suggest that kiwi's nutrients may make bones stronger and reduce the risk of fractures, especially when part of a balanced diet.

How much kiwi should I eat for better bone health?

There's no exact amount, but including kiwi as part of your daily fruit intake can contribute to overall bone health.

Are there other foods I should eat with kiwi for better bone health?

Yes, foods rich in calcium like dairy products, leafy greens, and fortified foods, along with regular exercise, also support bone health when combined with kiwi.

Can I eat kiwi if I have osteoporosis?

Yes, kiwi can be part of a bone-healthy diet for people with osteoporosis, but it's important to consult with a healthcare professional for personalised dietary recommendations.

Are there any side effects to eating too much kiwi?

A: Eating too much kiwi may lead to digestive issues for some people due to its fibre content, but in general, eating moderately is safe and beneficial for most people.

Summary

Kiwi fruit is not just delicious, it's also good for your bones. Inside that fuzzy brown skin, kiwi is loaded with vitamins and minerals that help keep your bones strong and healthy. One of the big ones is vitamin C, which helps make collagen, the stuff that holds your bones together. Kiwi also has vitamin K, which helps your body use calcium, another important nutrient for bones. When your body has enough calcium, it can keep your bones nice and strong, which means you're less likely to break them.

Scientists have done studies to see if eating kiwi can help your bones. They found that people who eat kiwi regularly tend to have stronger bones and are less likely to break them. So, adding kiwi to your diet can be a yummy way to keep your bones healthy.

But remember kiwi is just one part of a healthy diet for your bones. You also need to eat other foods that are good for bones, like milk, cheese, yoghurt, and leafy greens. And don't forget to do activities like running, jumping, and playing sports, which help make your bones even stronger.

Kiwi is safe for everyone to eat, from little kids to grown-ups, as long as you're not allergic to it. If you have any questions about eating kiwi or keeping your bones healthy, it's always a good idea to talk to a doctor or a nutritionist. They can give you more tips on how to take care of your bones and stay strong and healthy for a long time.