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Oleate, a common dietary fat found in olive oil, restored proper metabolism of fuel in an animal model of heart failure, researchers report. Heart failure affects nearly 5 million Americans, and more than half a million new cases are diagnosed each year. Heart failure is not the same as having a heart attack – it is a chronic disease state where the heart becomes enlarged, or hypertrophic, in response to chronic high blood pressure which requires it to work harder to pump blood.