Here's another definition of addiction, from Ken Keys Jr. You can read more in "The Handbook to Higher Consciousness."
Keys tells us that we are addicted to something if we have a negative emotional reaction if we cannot have it. For example, I am addicted to my friends being on time if I become angry when they are late. I am addicted to my job if I fear losing it. I am addicted to eating healthy food if I have an anxiety attack when I cannot find what I consider "healthy."
I like this definition very, very much.
The way to undo addictions, according to Keys, is to uplevel them to preferences. I can recognize my desire to eat healthy food, but if I simply prefer it, without having a negative reaction when I am eating at my unhealthy relative's house, I will have saved myself a lot of pain.
I can also be addicted to "not doing" things. For example, if I become really stressed out and angry when I have to pay my taxes, I am addicted to not paying taxes, even if I pay them every time. It is our emotional responses, our "emotion backed demands" for things that indicates addiction.
This works with all emotions, and all things. Its a really great thought to keep in mind! See if it helps you too.
Yes, even keeping to a healthy diet can be an addiction if it intereferes with your normal life... If you can control it effectively, than it's ok. Thanks for your comment.