Cholesterol levels can be lowered in as little as 20 days with the right lifestyle changes. Start by eating a healthy, balanced diet that is low in saturated fats and rich in fiber-rich foods like fruits, vegetables, whole grains, and legumes. Additionally, engage in regular physical activity, like walking, biking, or swimming. Reducing stress and getting adequate sleep can also help to lower cholesterol. Finally, talk to your doctor about medications that may help, such as statins. With the right combination of lifestyle changes and medical advice, you can lower your cholesterol in just 20 days.