The lack of brain food stems from the messages that people encounter, will encounter, or have encountered on a daily basis. These instances may be consciously or subconsciously. By being exposed to the large amount of ignorance that exists in society, it is easy to understand why a significant portion of societys mental state grows at a significantly low level.
By being subject to this debacle of programming, we are food poisoned. We are exposed to advertising that is not intended to be healthy for the mind but as a means of preventing people from thinking about anything. If you preoccupy the mind with endless hours of thought free entertainment programming, ones thoughts are going to reflect entertainment programming. By doing this, a disproportionate percentage of people today and people in the future will suffer from mental stagnation stemming from their food poisoning.