Please tell the fat that said you only care about outer beauty that talking with her made you realize she's very ugly on the inside too.  That sounds a little shallow. Perhaps better to quote Juvenal..  Mens sana in corpore sano  A healthy mind in a healthy body.  My belief is, that a good, perhaps overwhelming share  of fats in the US are food addicts. Getting so fat so soon .... that is very unusual. Behavioral addictions can have far reaching neurological effects due to changes in the brain's reward and motivational parts.