We look at the price and make a determination if it is worth the money to find out. Sometimes we buy it but most often we don't. They are helping us set up files for that food and that brand so that we can make a determination if we want to buy the item. Our minds work the same way with everything we come in contact with. We classify objects, animals and people in the same manner.
Most people are afraid of snakes.
If they have not had any direct contact with snakes, they will most likely go to their grave afraid of snakes. We can list all sorts of phobias and make the same analysis. Unfortunately, we do the same things with people.