No. You are generally worried for your friends health - She's talking about strangerss. This girl is your friend and has had health problems related to her health, so you worry about her, because she's your friend. You'd worry about a friend who has had problems related to drinking, but still drinks heavily, right? So, if a stranger comes up and says to your friend "You should lose weight, that's so unhealthy, it's different, they don'ttt care about her health, you do, because she's your friend.