Your taste and desire for food changes with diet.
I can tell you this is a fact. When I originally changed my nutrition, good foods actually started to taste, good. As I progressed the foods I used to crave now gave way to healthier options. I've now went off the deep end.
The key is to give it a chance. A few weeks minimum. It also takes time to learn how to prepare healthier options. One of the best ways to prepare vegetables is on a cookie sheet with olive oil and spices. 45-60 minutes and you have great vegetables. Onions, Sweet Potatoes, Carrots, Beets, Cauliflower, etc.