If you ever go to a nutritionist they'll tell you that, and they may even give you recipes!
But this is mostly an exercise in futility. Why? Because going to McDonalds tastes better. So people will revert and not solve their problem. Diets don't work, and new fad diets come out, and the industry cycle continues.
The problem with diets and lifestyle changes that are proposed in common social discourse is that we are always missing the most important step which is teaching citizens how to cook. As a nation I wish we would spend more time focusing on good culinary skills, and that is an investment that would pay dividends not only in healthier waistlines, but also in an increased interest in the quality of our food and produce.