Assuming it is the same person if you do a search on the name Russell Grenning some very interesting things are revealed about his back ground.

But where do most normal people who stay "faithfully" tuned to their TV sets get their "information" about what foods they should eat?

Mostly from TV advertising and the advertising in popular consumerist promoting magazines such as the Women's Weekly etc.
With rare exceptions most of the foods thus advertised are highly processed, loaded with sugar. And all kinds of additives and preservatives, none of which are conducive to long term good health.

Put in another way most of the highly processed foods including most dairy products are packages of toxic chemicals.

Children also learn about their food preferences from their parents. Such early preferences and habits usually have life long consequences, including the diseases that they will develop later on in life.

In his book The Future of Food Michael Pollan quite rightly advises that noone should eat anything that their grand parents would not recognize as food. He, and others too, quite rightly recommend that a useful guideline to the nutritional qualities of any packaged and processed foods are the number of items listed on the table of contents - the more items the worse the "food".

Re my paragraph on children. What are children whose parents ONLY consume junk "foods" being taught, and set up for in their later life, including their formative teenage years.

That having been said why not do a search on the topic Food As Medicine?
This topic is not new. Years ago Henry Bieler wrote a very informative book on the topic.
Highly processed "foods" full of sugar and toxic chemicals are the very antithesis of food as medicine.

People are far too stupid to decide on ALL things in life. The so called educated ones are more stupid than the, let's call them, The Blue Collar Workers. Whilst all you've ever needed to succeed scholastically is a good memory (eg; Rhodes Scholar), the rest rely on what abilities they have naturally. In any event spending too much time on non domestic issues has resulted in a total ignorance on the subject of food. I think PC has a lot more to answer to in life than food. I'm actually not sure how PC is relevant to food and eating habits.