Nobel Prize in Physiology or Medicine for the discovery of nitric oxide as a signal in the cardiovascular system
The Nobel-winning discovery your doctor probably never had time to explain
For decades, researchers knew blood vessels could somehow widen on their own. They just didn't know how.
Then three American scientists, Robert Furchgott, Louis Ignarro and Ferid Murad, found the answer. The thin lining inside your arteries produces its own signaling molecule: nitric oxide. Their work earned the 1998 Nobel Prize.
Think of a garden hose. Squeeze it and the pressure jumps. Every artery is wrapped in a thin layer of muscle that can squeeze the same way. Nitric oxide is the signal that tells that muscle to loosen its grip, so blood flows through with less force.
Here is the part that matters after 50: research suggests nitric oxide production tends to decline with age. Less of the "relax" signal can mean vessels that stay tighter than they should.
Your body builds nitric oxide from one amino acid, L-Arginine. So why not just take arginine? Because a large share of the arginine you swallow is broken down in the gut and liver before it ever reaches your bloodstream.
That's where watermelon comes in. L-Citrulline, an amino acid first identified in watermelon and named after it (Citrullus), takes a different route. Your kidneys convert it into arginine, giving your body a steadier supply.
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