There's a lot in there about why the Common Wisdom is built on bad science - the big one is the 7 Countries paper that cherry picked the countries to get the results they wanted, and ignored the 14 countries that didn't show the required results. This is where Saturated Fat = Bad came from.
The book Good Carbs, Bad Carbs opened my eyes to why Atkins works - lots of science references in there.
With personal experimentation this year, I'm beginning to work out what I can eat and not have problems in the short term. This experience is lining up with the paleo diet. It's much harder to tell if the long term problems will follow the same way, but if I feel physically better now, that can't be bad. I am thinner, healthier, more muscular and have better endurance than at any other point in my life, and I'm 44.
YMMV
I have experienced exactly this phenomenon.
The science for nutrition in humans is very difficult to pin down - there are just too many external variables, and the human body does a fantastic job in working with whatever it gets as a fuel in the short term that masks a lot of what is bad.
Personally, I'm convinced there's something that rings true in the Paleo movement, and I'm trying that out now to see how it works for me.