>But we never see an advertisment for the good food we can feed our brain with:books, self education, growing as a person.

It doesn't sell as well as the junk food. At the supermarket, the POS items aren't carrots, they are Mars bars. Due to the incentives model, the only way to get healthy is to take responsibility of what we consume for ourselves. Funny thing is, once we do this, the sellers are incentivized to supply what we demand. They do that now too of course, we just demand shit.