NEW YORK — Christopher Edginton was taking medication and trying to improve his diet when his cholesterol shot up anyway four years ago. His doctor suggested a new approach."He said you’ve got to get rid of some things you’re doing, some of the stresses in your life," recalls Prof Edginton, a professor at the University of Northern Iowa who regularly travelled internationally and had so many job titles that he had a four-sided folding business card.Prof Edginton heeded the doctor’s advice.Now 69 years old, Prof Edginton is down to one teaching job and some scaled-down responsibilities in professional organisations.His level of so-called bad cholesterol, or low-density lipoprotein (LDL), has dropped to 62 milligrammes per decilitre from 121mg/dL in 2012. (The latest cholesterol-treatment guidelines, from 2013, no longer set specific targets; his doctor says 50 to 70 is reasonable for Prof Edginton, who had two previous heart attacks.)Of all the factors contributing to high cholestero...

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