You can’t develop healthy eating habits if you don’t enjoy preparing your own meals from scratch. If you don’t enjoy, slicing, dicing, chopping, shaving, and grating there’s little hope, I’m sorry to say.
What it comes down to is the source of food you ingest. The less it’s been fiddled with by people, and processes, the better. What does this mean exactly? It means that readymade dishes, precut, or processed foods are out of the question. It means that if you want chicken soup or vegetable soup, you don’t use bouillon for flavor and then pour in a precut frozen vegetable medley that tastes of absolutely nothing. It means that if you’re in the mood for pasta you don’t get to use carbonara sauce out of a jar.