The former Disney star, who is dating Justin Bieber, was hospitalized and treated for malnutrition after complaining of headaches and nausea, and rubbished reports that the cause had anything to do with a mini-Bieber.
Talking about the claims, she told Now magazine, 'I laughed. There is nothing you can do. You just have to blow them off.'
Meanwhile she said that the real cause was her poor diet.
'I wasn't really healthy. I was low in iron. I was dehydrated. I had actually got back from vacation, so I wasn't overworking.
'I'm probably not the healthiest eater.'
Selena turns 19 on July 22.