Please choose the correct ending to complete the given sentence: Health: [header] How to maintain an erection [title] Improve your nutrition. [step] Certain foods, such as those that are fatty, fried, sugary, and processed, can result in decreased blood flow throughout your body and can contribute to a vascular form of erectile dysfunction. Increase your intake of fruits, vegetables, whole grains, and heart-healthy fats to improve your blood circulation and increase the amount of time you're able to maintain an erection.

Ending1: [substeps] Keep a food journal to keep in front of you at all times. You should see a doctor to ask any questions you have, or to have your doctor get a blood test. Ending2: [substeps] Eat complex carbohydrates, such as whole grains. These are naturally high in potassium, which is vital to preventing an erection. Ending3: Try taking an afternoon walk or a long nap each day. Avoiding high blood pressure can help by reducing nervous system swelling. Ending4: [substeps] A diet high in animal fat will put pressure on your cardiovascular system, potentially damaging your blood flow. Try to limit the amount of meat and cheese you eat.

Answer format: ending1/ending2/ending3/ending4