You can transform painlessly to your ideal height and weight but lose 1 year at the end of your life.
You wake up tomorrow morning at your ideal height and weight and remain at the ideal for the rest of your life. You enjoy all the health benefits of your ideal height and weight but your lifespan will be one year shorter than otherwise. Are you a man or woman? What age? What is your ideal height and weight? If you share your current height and weight in your post you get 2 months added to your lifespan. Will you accept?