Is Watermelon A Natural Viagra?
Researcher Says Popular Summer Fruit May Have Viagra-Like Effect On Blood Vessels
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Watermelon may be a natural Viagra, says a researcher. That's because the popular summer fruit is richer than experts believed in an amino acid called citrulline. (CBS/AP)
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Food Pyramid
The government's latest guidelines for healthy eating get personal.
watermelon.
Watermelon may be a natural Viagra, says a researcher. That's because the popular summer fruit is richer than experts believed in an amino acid called citrulline, which relaxes and dilates blood vessels much like Viagra and other drugs meant to treat erectile dysfunction (ED).
"We have known that watermelon has citrulline," says Bhimu Patil, PHD, director of the Fruit and Vegetable Improvement Center at Texas A&M University, College Station. Until recently, he tells WebMD, scientists thought most of the citrulline was in the watermelon rind. "Watermelon has more citrulline in the edible part than previously believed," he says.
How could watermelon be a natural Viagra? The amino acid citrulline is converted into the amino acid arginine, Patil says. "This is a precursor for nitric oxide, and the nitric oxide will help in blood vessel dilation."
So, the burning question: How much watermelon does it take?
"That is a good question," Patil says. Unfortunately, "I don't have an answer for that."
He does know that a typical 4-ounce serving of watermelon (about 10 watermelon balls) has about 150 milligrams of citrulline. But he can't say how much citrulline is needed to have Viagra-like effects.
He's hopeful that someone will pick up on his research and study the fruit's effect on penile erections.
Watermelon's Viagra-Like Effects
On hearing about the Texas finding, Irwin Goldstein, MD, editor-in-chief of The Journal of Sexual Medicine, was underwhelmed. Suggesting a man feast on watermelon to boost performance, he says, "would be the equivalent of someone dropping a beer bottle in Minneapolis, where the Mississippi River starts, and hoping to see it make an impact on someone in New Orleans."
"To say that watermelon is Viagra-like is sort of fun," says Goldstein. "But to even vaguely hope that eating watermelon will alleviate ED is misleading."
"The vast majority of Americans produce enough arginine," adds Goldstein, medical director of Alvarado Hospital Medical Center, San Diego, and clinical professor of surgery, University of California San Diego School of Medicine. "Men with ED are not deficient in arginine."
Though arginine is required to make nitric oxide, and nitric oxide is required to dilate blood vessels and have an erection, "that doesn't mean eating something that is rich in citrulline will make enough arginine that it will lead to better penile erections," Goldstein says.
Goldstein has served as a consultant for many companies that make ED drugs.
Calling watermelon a natural Viagra is "clearly premature," says Roger Clemens, DrPH, adjunct professor of pharmacology and pharmaceutical sciences, University of Southern California, Los Angeles, and a spokesman for the Institute of Food Technologists.
Clemens studied the amino acid arginine himself, researching a supplement to improve vascular flow for patients with hardening of the arteries or atherosclerosis. He has since abandoned that line of research, he says.
It can require a lot of watermelon to boost blood levels of arginine, he adds. In a study published in 2007 in Nutrition, he says, volunteers who drank three 8-ounce glasses of watermelon juice daily for three weeks boosted their arginine levels by 11%.
Watermelon is low in calories and provides potassium and the phytonutrients lycopene and beta-carotene, in addition to the citrulline.
Clemens' advice on watermelon and the Fourth of July? "Put salt on it and enjoy."
Just don't expect fireworks anywhere but in the sky.
By Kathleen Doheny
Reviewed by Brunilda Nazario
©2005-2008 WebMD, LLC. All rights reserved.



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See all 51 CommentsSALT on watermelon? Yikes!
I think watermelon is a natural diaretic.(SP?)
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Posted by erasmus81 at 11:37 AM : Jul 02, 2008
YES!!! Salt on watermelon is the best. (Salt and pepper on canteloupe)
Bring on the rocket''s red glare!
Posted by sillywilly4
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Only if rear-entry is going to be practiced does anyone really want to ask that question... who''d want to rear-entry anyway? That''s gross.
AH, the good ol days.
AH, the good ol days. Posted by drputt45 at 12:58 PM : Jul 02, 2008
And I was thinkin'', REALLY?
I am a bit slow sometimes, but I finally got it.:)
"That is a good question," Patil says. Unfortunately, "I don''t have an answer for that."
Eat the whole danm melon if you have to. Eat until your belly bulges, and your member rises!!!
This guy got arrested, butt naked in this watermelon patch. According to police he was exactly having *** with a watermelon.
Actually I think we will brawl anywhere over melons.
The questions that come to mind are:
1. If we eat the seeds will we be more fertile also?
2. Why not just eat the rind and throw away the rest?
3. Are athletes now going to be stuffing melon before the big event? Oh I guess that applies to everyone else''s more important big event also.
4. Has the news world really gotten so desperate for something to say that they will seize on this story? I could point out world shaking events all day long that beat this.
Posted by kenhamlett
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Hey Watermelons...Obama getting a great deal on a home loan....big news day! ;-)
Gee... I think there are many serious stories on the news site... and yet... you decided to click on this story...
I think you feel embarrassed for enjoying a nice little story that actually is actually news worthy as it describes some of the active ingredients in a very commonly eaten fruit/vegetable.
Lighten up!!! It is okay to read stories like this in addition to the other more serious stories (that is... if you really are interested in those stories...) Did you actually click on any of the links for the stories you say should be represented???
You really make yourself appear pretty stupid when you make comments like that... After all... if it did not interest you ... why did you click on it and read it???
It is also a complete misallocation of space avaiable for worthier stories.
Perhaps Doheny thought it might pump up her futures in the watermelon market.
Spit out the seeds, liberals - or else you''''ll get pregnant.
Posted by OneAmericanzero- at 07:04 PM : Jul 02, 2008
Recons Swallow! Ask Shrub
I just don''t know about going out
and having the date ask, "So when
are we gonna eat that watermelon in the
back seat?"
Posted by fsw3 at 04:57 PM : Jul 02, 2008
Try it with cheese. Shred the cheese, preferably feta cheese, and sprinkle it on cut watermelon.
Out of this world.
Of course, Goldstein is most likely closely tied with the private profit special interest pharmaceuticals.
Just food for thoughts on a summer night.
Ok, I read this yeasterday and tried it last night.
My findings:
A condom fits better.
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