Dietary factors contributing to high cholesterol include the intake of saturated and trans fats, commonly found in processed foods, red meats, and full-fat dairy products. Additionally, excessive consumption of sugar and refined carbohydrates can negatively impact cholesterol levels. A diet low in fiber, particularly soluble fiber found in fruits, vegetables, and whole grains, can also contribute to cholesterol imbalance. Maintaining a balanced diet can help regulate cholesterol levels and promote heart health.