Research says that most people have an awful lot of cookies or other junk in their pantry. When researchers have studied people's trash, they have seen a clear disconnect between what people will say they are eating and what ends up in their trash bins.
So what should you do? Clean out your kitchen. Get rid of the stupid food. Start with the cupboard. If you have sugar laden cereals, get rid of them. Choose high fiber cereals like oatmeal, granola and healthy whole grain cereals.
Toss out your pre-prepared foods. "Complete" meals like Hamburger Helper, Sloppy Joe mixes and Rice a Roni are full of fat and salt that you just don't need. There are better choices. Keep good quality pasta sauces on hand along with whole wheat pasta for a quick meal. Purchase your own spices to make Sloppy Joes and tacos and you'll easily be able to make a healthy version. Fill your pantry with the ingredients that you need to make fresh, healthy recipes: rice, beans, lentils, whole wheat pasta, canned tomatoes, canned tuna and low-sodium chicken broth.
The same rule holds true for snacks. If it's processed, like crackers, Cheez-its, potato chips, and Cheetos, toss them out. If you are a savory / salty snacker, fill your pantry with nuts.
This also holds true for those Oreo cookies. If you are a sweet snacker, get rid of the cookies, cakes, and candy and fill your kitchen with fruit. Canned, fresh, frozen, or dried; it doesn't matter. There's great evidence that you'll be just as satisfied (and happier) eating fruit rather than candy.
After finishing with your cupboard, it's time for the refrigerator. Most of the frozen dinners are pretty bad for you.
The best way to fill up your kitchen with healthy ingredients is planning. Following a plan will help you slowly but surely buy the pasta, rice, beans, spices, herbs, vegetables, chicken stock, etc. that you need to make great tasting healthy recipes.
The How and Why of healthy eating. Everything from why you should eat breakfast to whether red meat or coffee is bad or good for you, all in straightforward terms.