Hi there! Been lurking for a while and this is my first post
I think your response is healthy. Eating disorders are usually about feeling out of control and then being overcontrolling or undercontrolling with food. Although it was an extreme for the girl in the show, you sound like you have a healthy degree of control (caring what you eat). The fact that you can make good choices can be very motivating, so congrats to you for that! I think that is a very healthy motivation and it sounds like you were jolted into a realization by an extreme case. Feeling powerful and strong and wanting more of that is also a good motivator!!
For me, shows and stories about eating disorders are like a car wreck...I can't help but look at them, if only for the "wow, hope that turns out okay and I'm glad it wasn't me" factor.