This step will help you figure out the foods your body really does like and the foods it doesn't. Think of tuning a guitar. You have to tune it exactly right or it will sound all wrong. Over time you'll learn how to do this for your body. You'll learn to enjoy feeling good after you eat a meal and eventually you wont be satisfied with anything less.
How do you feel a half hour after eating pepperoni pizza for a meal? Do you feel amazing and energetic? Or do you feel nausea, discomfort, heartburn, or (heaven forbid) gassy? I get painful heartburn after eating anything with tomato sauce or anything spicy like pepperoni. That doesn't mean I never eat pepperoni pizza. I do, just not very often because I know how I'll feel afterward. This may be different for you. You may feel great after eating pizza 0-5.
I've learned certain things about my own body, what foods agree with me and what foods don't. For example: I don't like candy at all but I love chocolate in very small amounts. I don't like chocolate ice cream ever unless it's Rocky Road. I can't eat breakfast foods like pancakes, muffins, or waffles in the morning because they give me heartburn. But I can eat them later in the day and I'll feel fine. If I eat eggs in the morning they can only be boiled or sunny side up. Scrambled make me feel nauseous but I can eat scrambled later in the day. I don't like white bread, only wheat. I like chicken breasts' but not chicken thighs. The thighs are too greasy (but my husband loves them). I love melted cheese all the time. I prefer corn tortillas over flour tortillas. I can only eat a small amount of chips at a time or I taste them for hours after the meal which grosses me out. I only eat half a bun with a hamburger because the whole bun is too much. I love vegetables. I'm not a huge fan of fruit. Fruit is good and I like it but usually I just don't care about it (but when I was pregnant I craved fruit constantly). When I eat steak I can only have a few bites or I feel like I have weights in my stomach. I don't like how the taste of raw onions goes on for hours after a meal. I love macaroni salad but I don't like macaroni and cheese. I love sea food anytime as long as I have a huge bowl of lemons. But I can't eat a lemon whole like I'd love too because it hurts my stomach and my teeth.
These are all examples of how my body works. I've learned my likes and dislikes. I've learned which foods make my body feel good and bad. You have to figure out for yourself what you like and how different foods make your body feel. What foods do you really love? What foods do you think you love but will soon realize aren't all that great? Learn to fine tune your body so that it is satisfied with every meal.