Dietary changes that effectively lower cholesterol levels include increasing the intake of soluble fiber, found in foods like oats, beans, and certain fruits. Reducing saturated fat from sources like red meat and full-fat dairy is crucial as well. Incorporating more plant-based foods and healthy fats, such as those from nuts and olive oil, can further support heart health. Additionally, regular physical activity and maintaining a healthy weight are essential lifestyle changes that complement dietary adjustments in managing cholesterol levels.