Arginine is essential for the synthesis of nitric oxide, proline and creatine which are on their own right required for various biological processes. For example, nitric oxide helps relax vascular vessels and improves immune function. Proline is essential for joint function and wound healing. Creatine plays important roles in neurologic and muscular functions.

The nutrient in watermelon responsible for the increased plasma arginine level is called citrulline. On average,  a gram of watermelon flesh contains 1.5 mg citrulline.

Citrulline, an amino acid, is a precursor for the synthesis of arginine. An intake of 1 kg of watermelon flesh provides enough citrulline for the synthesis of 40% of the mean daily arginine intake ( 3.8 g) by an American adult.

The study subjects (healthy, non-smoking, 12 men and 11 women, 36–69 years old), were treated with controlled diet and 0 (control), 780 (equivalent to 1 g citrulluine), or 1560 (equivalent to 2 g of citruline) grams of watermelon juice per day. The treatments lasted for three weeks. Compared with the control treatment, fasting plasma arginine concentrations increased 12% and 22% after 3 weeks of the lower-dose watermelon and the higher-dose watermelon treatments, respectively.

Furthermore, the higher dose watermelon juice increased plasma ornithine level by 18%.

The study was published in the Journal of Nutrition, March 2007 issue.

 

 


Watermelon related:
Nutritional facts on watermelon seed
Nutritional value and health benefits of watermelon
Eating watermelon increases arginine level

Antioxidant and fruits related articles:
Goji berry antixoxidant activity and health benefits
Blueberry antioxidant and health benefits
Pomegranate juice: antioxidant source
Apple fruit, juice (cider) and health benefits on cancer, diabetes, and cardiovascular diseases

 



L-arginine related articles:
L-arginine health benefits
List of foods high in arginine content
L-arginine, nitric oxide, sex, and erection (erectile dysfunction)

Source:

J. Collins, G. Wu, P. Perkins-Veazie, K. Spears, P. Claypool, R. Baker, B. Clevidence. Watermelon consumption increases plasma arginine concentrations in adults. Nutrition, Volume 23, Issue 3, 2007, Pages 261-266 .