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A growing body of evidence is linking unfiltered coffee to higher levels of both LDL and total cholesterol. The reason, scientists suspect, has to do with terpenes—compounds found in the oil from coffee beans. Unfiltered coffees such as those made in an espresso machine or with a French press or a percolator have more terpenes, which interfere with cholesterol metabolism. "Filters catch surface oils," says Nancy Snyderman, MD, chief medical editor at NBC News and author of Medical Myths That Can Kill You: And the 101 Truths That Will Save, Extend, and Improve Your Life
. "I learned the hard way that gold filters do very little. Paper filters are far more effective."