The science-backed reasons watermelon is one of summer's healthiest fruits

Watermelon is a summertime favourite for its refreshing taste, but nutrition experts say the fruit delivers far more than just hydration.

Made up of about 95% water, watermelon can help replenish fluids while providing vitamins, antioxidants and plant compounds linked to several health benefits, according to registered dietitian Cynthia Sass.

One of watermelon's biggest advantages is its ability to support hydration. Staying properly hydrated helps regulate body temperature, lubricate joints, protect the spinal cord and reduce fatigue, making water-rich foods like watermelon a valuable addition to a balanced diet.

The fruit is also among the richest natural sources of lycopene, a powerful antioxidant that helps combat oxidative stress caused by free radicals.

Research suggests lycopene may play a role in supporting heart health while lowering the risk of certain chronic conditions, including some cancers, age-related macular degeneration and Type 2 diabetes.

Watermelon also contains the amino acid L-citrulline, particularly in the white rind beneath the flesh.

This compound may help relax blood vessels, improve blood flow and support healthy blood pressure. Some studies have also linked L-citrulline to improved endurance exercise performance and muscle oxygenation.

Beyond cardiovascular health, watermelon provides vitamins A and C, which contribute to healthy skin by supporting collagen production and protecting skin cells. Lycopene may also offer some protection against sun-related skin damage.

Despite its naturally sweet taste, watermelon can also support weight management. Because it is low in calories and high in water, it promotes fullness, making it a healthier alternative to processed sugary snacks.

Research has also associated regular watermelon consumption with improvements in cholesterol levels, waist-to-hip ratio and blood pressure.

Athletes may benefit as well. Drinking watermelon juice before endurance exercise has been linked to reduced muscle soreness for up to three days after physical activity.

Although watermelon is relatively low in fiber, it still supports digestive health through its combination of water, fiber and prebiotics, which help nourish beneficial gut bacteria and promote healthy digestion.

One cup of diced watermelon contains about 46 calories along with vitamins A and C, potassium, magnesium and antioxidants, making it a nutrient-dense choice for most people.

However, experts say some individuals should enjoy watermelon in moderation. People with diabetes may want to pair it with protein or healthy fats to help reduce blood sugar spikes, while those with irritable bowel syndrome (IBS) may experience digestive discomfort because watermelon is high in FODMAP carbohydrates.

Those with oral allergy syndrome linked to ragweed pollen may also experience allergic reactions after eating the fruit.

To choose a ripe watermelon, experts recommend looking for a creamy yellow or pale spot on the rind, indicating it ripened on the ground before harvest.

Washing the fruit before cutting it can also help reduce the risk of bacteria on the outer skin.

Whether enjoyed fresh, blended into smoothies, tossed into salads or frozen into popsicles, watermelon remains a refreshing way to boost hydration while providing a variety of nutrients that support overall health.