Just two days of mostly oatmeal cut bad cholesterol by 10% and triggered beneficial changes in gut bacteria linked to better heart and metabolic health. Credit: Shutterstock Eating mostly oatmeal for just two days may significantly reduce cholesterol, according to a clinical trial from the University of Bonn published in Nature Communications . The study focused on people with metabolic syndrome, a cluster of conditions that includes excess body weight, high blood pressure, elevated blood sugar,