But there may be something unique to Sweden in terms of cancer susceptibility and cell phone use, experts say, and therefore Hardell's findings may not be widely applicable.

CNN: Study fails to end debate on cancer, cell phone link

Olive oil is also a rich source of potent antioxidants called polyphenols, which may help slow the progression of atherosclerosis (narrowing of the arteries because of cholesterol and inflammatory cell accumulation) by decreasing the susceptibility of bad cholesterol to oxidative damage and stress.

CNN: How heart-healthy is olive oil?

It is now known that genetic variability accounts for 25% of susceptibility to the disease, but that variations in the sickle-cell gene contribute to only a fraction of that.

ECONOMIST: Genetics and infectious disease: The germ of an idea | The