Looking good takes a certain amount of discipline. You have to eat right and exercise and take time to groom yourself. I wonder how much of the increase in su

Looking good takes a certain amount of discipline. You have to eat right and exercise and take time to groom yourself. I wonder how much of the increase in success for attractive people is caused directly by their looks, ie greater self-esteem and unfair treatment. How much of the increase is not caused by good looks but correlates with good looks due to a deeper cause such as greater self-discipline?