Are They Pink.

Watermelon

 

 Watermelons are mostly water — about 92 percent — but this refreshing fruit is soaked with nutrients. Each juicy bite has significant levels of vitamins A, B6 and C, lots of lycopene, antioxidants and amino acids. There's even a modest amount of potassium. Plus, this quintessential summer snack is fat-free, very low in sodium and has only 40 calories per cup.

Scientists have taken notice of watermelon's high lycopenelevels — about 15 to 20 milligrams per 2-cup serving, according to the National Watermelon Promotion Board — some of the highest levels of any type of fresh produce. Lycopene is a phytonutrient, which is a naturally occurring compound in fruits and vegetables that reacts with the human body to trigger healthy reactions. It is also the red pigment that gives watermelons, tomatoes, red grapefruits and guavas their color.  Lycopene has been linked with heart health, bone health and prostate cancer prevention. It's also a powerful antioxidant thought to have anti-inflammatory properties, according to Victoria Jarzabkowski, a nutritionist with the Fitness Institute of Texas at The University of Texas at Austin. 

To really maximize your lycopene intake, let your watermelon fully ripen. The redder your watermelon gets, the higher the concentration of lycopene becomes. Beta-carotene and phenolic antioxidant content also increase as the watermelon ripens. Nevertheless, "All parts of the watermelon are good. There are a lot of nutrients throughout," said Jarzabkowski. This includes the white flesh nearest the rind.
Another phytonutrient found in the watermelon is the amino acid citrulline, which converts to the amino acid arginine. These amino acids promote blood flow, leading to cardiovascular health, improved circulation, and according to research at Texas A&M University, erectile dysfunction improvement (you'd probably have to eat a lot of the fruit to get a Viagra-like effect, though).

Watermelon facts

Some fun facts about watermelons, from the National Watermelon Promotion Board and Science Kids. 
The watermelon (Citrullus lanatus) is related to cucumbers, pumpkins and squash.
The watermelon probably originated in the Kalahari Desert in Africa.
Egyptians placed watermelons in the burial tombs of kings to nourish them in the afterlife. The first recorded watermelon harvest is depicted in Egyptian hieroglyphics from about 5,000 years ago.
Merchants spread the use of watermelons along the Mediterranean Sea. By the 10th century, watermelons had found their way to China, which is now the world's top producer of watermelons.
The Moors in the 13th century brought watermelons to Europe.
The watermelon likely made its way to the United States with African slaves.
Early explorers used watermelons as canteens.
The first cookbook published in the United States in 1776 contained a recipe for watermelon rind pickles.
About 200 to 300 varieties are grown in the United States and Mexico, but only about 50 varieties are very popular.
By weight, watermelon is the most consumed melon in the United States, followed by cantaloupe and honeydew.
The watermelon is the official state vegetable of Oklahoma.
All parts of a watermelon can be eaten, even the rind.
Guinness World Records says the world's heaviest watermelon was grown by Lloyd Bright of Arkadelphia, Arkansas, in 2005. It weighed 268.8 lbs. (121.93 kg).
The United States ranks fifth in the worldwide production of watermelons. Forty-four states grow watermelons, with Florida, Texas, California, Georgia and Arizona leading the country in production.
A seedless watermelon is a sterile hybrid, which is created by crossing male pollen for a watermelon, containing 22 chromosomes per cell, with a female watermelon flower with 44 chromosomes per cell. When this seeded fruit matures, the small, white seed coats inside contain 33 chromosomes, rendering it sterile and incapable of producing seeds.