Watermelon is a delicious and refreshing fruit that's also good for you.
It contains only 46 calories per cup but is high in vitamin C, vitamin A and many healthy plant compounds.
Here are the top 9 health benefits of eating watermelon.
1. Helps You Hydrate
Drinking water is an important way to keep your body hydrated.
However, eating foods that have a high water content can also help. Interestingly, watermelon is 92% water (1).
The combination of water and fiber means you're eating a good volume of food without a lot of calories.
2. Contains Nutrients and Beneficial Plant Compounds
As far as fruits go, watermelon is one of the lowest in calories — only 46 calories per cup (154 grams). That's lower than even low-sugar fruits such as berries (2).
One cup (154 grams) of watermelon has many other nutrients as well, including these vitamins and minerals:
• Vitamin C: 21% of the Reference Daily Intake (RDI)
• Vitamin A: 18% of the RDI
• Potassium: 5% of the RDI
• Magnesium: 4% of the RDI
• Vitamins B1, B5 and B6: 3% of the RDI
Watermelon is also high in carotenoids, including beta-carotene and lycopene. Plus, it has citrulline, an important amino acid.
Here's an overview of watermelon's most important antioxidants:
Vitamin C
Vitamin C is an antioxidant that helps prevent cell damage from free radicals.
Carotenoids
Carotenoids are a class of plant compounds that includes alpha-carotene and beta-carotene, which your body converts to vitamin A.
Lycopene
Lycopene is a type of carotenoid that doesn't change into vitamin A. This potent antioxidant gives a red color to plant foods such as tomatoes and watermelon and is linked to many health benefits.
Cucurbitacin E
Cucurbitacin E is a plant compound with antioxidant and anti-inflammatory effects. Bitter melon, a relative of watermelon, contains even more cucurbitacin E.
Watermelon is a low-calorie fruit high in some nutrients, especially carotenoids, vitamin C and cucurbitacin E.
3. Contains Compounds That May Help Prevent Cancer
Researchers have studied lycopene and other individual plant compounds in watermelon for their anti-cancer effects.
Though lycopene intake is associated with a lower risk of some types of cancer, study results are mixed. The strongest link so far seems to be between lycopene and cancers of the digestive system (1).
It appears to reduce cancer risk by lowering insulin-like growth factor (IGF), a protein involved in cell division. High IGF levels are linked to cancer
In addition, cucurbitacin E has been investigated for its ability to inhibit tumor growth.
4. May Improve Heart Health
Heart disease is the number one cause of death worldwide.
Lifestyle factors, including diet, may lower your risk of heart attack and stroke by reducing blood pressure and cholesterol levels.
Several nutrients in watermelon have specific benefits for heart health.
Studies suggest that lycopene may help lower cholesterol and blood pressure. It can also help prevent oxidative damage to cholesterol
According to studies in obese, postmenopausal women and Finnish men, lycopene may also reduce the stiffness and thickness of artery walls
Watermelon also contains citrulline, an amino acid that may increase nitric oxide levels in the body. Nitric oxide helps your blood vessels expand, which lowers blood pressure
Other vitamins and minerals in watermelon are also good for your heart. These include vitamins A, B6, C, magnesium and potassium.
5. May Lower Inflammation and Oxidative Stress
Inflammation is a key driver of many chronic diseases.
Watermelon may help lower inflammation and oxidative damage, as it's rich in the anti-inflammatory antioxidants lycopene and vitamin C
6. May Help Prevent Macular Degeneration
Lycopene is found in several parts of the eye where it helps protect against oxidative damage and inflammation.
It may also prevent age-related macular degeneration (AMD). This is a common eye problem that can cause blindness in older adults
7. May Help Relieve Muscle Soreness
Citrulline, an amino acid in watermelon, may reduce muscle soreness. It’s also available as a supplement.
Interestingly, watermelon juice appears to enhance the absorption of citrulline.
One small study gave athletes plain watermelon juice, watermelon juice mixed with citrulline or a citrulline drink. Both watermelon drinks led to less muscle soreness and quicker heart rate recovery, compared to citrulline on its own
8. Is Good for Skin and Hair
Two vitamins in watermelon — A and C — are important for skin and hair health.
Vitamin C helps your body make collagen, a protein that keeps your skin supple and your hair strong.
Vitamin A is also important for healthy skin since it helps create and repair skin cells. Without enough vitamin A, your skin can look dry and flaky.
Both lycopene and beta-carotene may also help protect your skin from sunburn.
9. Can Improve Digestion
Watermelon contains lots of water and a small amount of fiber — both of which are important for healthy digestion.
Fiber can provide bulk for your stool, while water helps keep your digestive tract moving efficiently.
Eating water-rich and fiber-rich fruits and vegetables, including watermelon, can be very helpful for promoting normal bowel movements.
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