Well, big business has heard those tips too. And they effectively counter all that good advice with a simple, ingenious plan. Now you must go through all the aisles to find what you're looking for. You have to at least look at their goodies even if you're not hungry. You don't have the Advantages that your neighborhood grocery store does.
People have to buy food, unless they grow their own.
Use them wisely and sparingly. That wasn't a joke. It didn't imply a lack of intelligence. Far from it. We have, of necessity, become immune to Advertisements.