Barley contains a powerful type of soluble fiber that helps keep cholesterol levels in check by effectively lowering total and LDL cholesterol without affecting HDL. This beta-glucan fiber works by preventing the body's absorption of cholesterol from food. Look for minimally processed pearled barley, the variety most commonly found in supermarkets.
And according to some powerful experiments by software engineer-turned-biohacker Dave Feldman, you can actually increase and decrease your cholesterol at will. It all depends on how much fat you eat — and, directly against mainstream dietary knowledge, the correlation is inverted. In other words, eating more fat will actually lower your cholesterol.