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).
A high water content is one of the reasons that fruits and vegetables help you feel full. The combination of water and fiber means you're eating a good volume of food without a lot of calories.
BOTTOM LINE: Watermelon has a high water content. This makes it hydrating and helps you feel full.
2. Contains Compounds That May Help Prevent Cancer
Researchers have studied lycopene and other individual plant compounds in watermelon for their anti-cancer effects.
Although lycopene intake is linked to a lower risk of some types of cancer, the results are mixed. The strongest link so far seems to be between lycopene and cancers of the digestive system.
Lycopene 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.
BOTTOM LINE: Some compounds in watermelon, including cucurbitacin E and lycopene, have been studied for their potential to prevent cancer.
3. May Improve Heart Health
Heart disease is the number one cause of death worldwide.
Lifestyle factors, including diet, may lower the risk of heart attacks and strokes 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 help 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.
BOTTOM LINE: Watermelon has several heart-healthy components, including lycopene, citrulline and other vitamins and minerals.
4. May Lower Inflammation and Oxidative Stress
Inflammation is a key driver of many chronic diseases.
Watermelon may help lower inflammation and oxidative damage since it's rich in the anti-inflammatory antioxidants lycopene and vitamin C.
In a 2015 study, lab rats were fed watermelon powder to supplement an unhealthy diet. Compared with the control group, they developed lower levels of C-reactive protein (a marker of inflammation) and less oxidative stress.
In an earlier study, humans were given lycopene-rich tomato juice with added vitamin C. Overall, their markers of inflammation went down and antioxidants went up. Watermelon has both lycopene and vitamin C.
As an antioxidant, lycopene may also benefit brain health. For example, it may help delay the onset and progression of Alzheimer's disease.
BOTTOM LINE: Lycopene and vitamin C are anti-inflammatory antioxidants found in watermelon. Inflammation is linked to many chronic diseases.
5. May Help Prevent Macular Degeneration
Found in several parts of the eye, lycopene helps protect against oxidative damage and inflammation.
It may also help prevent age-related macular degeneration (AMD). This is a common eye problem that can cause blindness in older adults.
Lycopene's role as an antioxidant and anti-inflammatory compound may help prevent AMD from developing and getting worse.
BOTTOM LINE: Lycopene may help keep eyes healthy and protect against AMD through its antioxidant and anti-inflammatory functions.
6. May Help Relieve Muscle Soreness
Citrulline, an amino acid in watermelon, may reduce muscle soreness.
Interestingly, watermelon juice appears to enhance the bio-availability 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.
The researchers also conducted a test-tube experiment, investigating the absorption of citrulline. Their findings suggest that citrulline absorption is most effective when it's consumed as a component of watermelon juice.
Other research has also looked at citrulline's potential to improve exercise endurance and performance. So far, citrulline doesn't seem to improve exercise performance in the amounts studied, but it's still an area of research interest.
BOTTOM LINE: Watermelon juice has some potential as a recovery beverage after exercise. Citrulline may be partially responsible for its effect of easing muscle soreness.
7. 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.
BOTTOM LINE: Several nutrients in watermelon are good for your hair and skin. Some help keep skin supple while others protect against sunburn.
8. Can Help 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.
BOTTOM LINE: Fiber and water are important for healthy digestion. Watermelon contains both.
Watermelon is a low-calorie, hydrating fruit that is a natural high antioxidant food, plus a source of vitamins and minerals that can help fight inflammation, free radical damage and prevent a number of serious illnesses.
The benefits of watermelon include containing a high amount of lycopene, a certain type of carotenoid that is currently of great interest to researchers because of its known antioxidant capacity and various potential health benefits. Lycopene is responsible for giving many fruits and vegetables, including watermelon, their deep red or pink color. While researchers have always known that tomatoes are a great source of lycopene, recently watermelon has also moved into the spotlight as another wise food choice for supplying this critical nutrient for fighting free radical damage.
Lycopene found in watermelon is a powerful antioxidant, meaning it has the ability to fight free radicals in the body that can damage cells. Additionally, benefits of watermelon include providing vitamin A (beta-carotene) and vitamin C, both known for having remarkable antioxidant and anti-aging properties that can ward off diseases. Excessive free radical damage has been linked to the onset of serious diseases, including cancer, heart disease, Alzheimer’s disease, arthritis and many others. In fact, the buildup of free radicals in the body is large to blame for the aging process and the toll is taken on the body.
Adding antioxidant, nutrient-rich and anti-inflammatory foods like watermelon to your diet is one way to limit bodily stress, keeping DNA damage to a minimum and slowing the aging process. Even if you are young and healthy, watermelon benefits include helping to relieve pain, improve exercise recovery, keep skin healthy and youthful, and help with detoxification.