Mate you have what I call
'rare sense' these days, it used to be called 'common sense' but it's quite obvious that only a small percentage of people use their brains these days for thinking rather than following the propaganda and B/S we are fed as a people without ever thinking about it.
Like I said earlier, most creatures know what they are supposed to eat, no one tells a cow, or horse or bird or pig or tiger etc what to eat, humans know what to eat, but some (many) choose to ignore it.
Put a human out in the wild to survive, and they will quickly work out what they need to eat, they will initially start to look for berries etc, while they will make a weapon of some sort and make it their priority to find some meat to eat, to the point where they will start eating each other if it comes down to the end.
People these days live despite their diet, not because of it, anyone that suggests we are supposed to eat processed sugars, flour, cakes, bread, processed meat, etc washed down with coke and soft drinks is just retarded. This point can really not even be argued, our body has not evolved to live on this stuff, and generally does not do well on it, as can be seen by just looking around, no studies required, just a need to open your eyes and see the average person walking the street with their fat gut, diabetes, food allergies, ill health, and a host of medications consumed just to keep you alive.
I have mates that are 10 years younger than me suffering from high blood pressure, kidney stones, one even had a heart attack at 39