I agree that heating changes the molecular structure of the oil and it is this change that produces the transfats that block the cells from vital nutrients. What is not made clear from the manufactures of these oils, and there are a vast number on the market, that there is no definitive data on which oils we should use for cooking purposes. Top of the charts there is coconut oil, olive and rapeseed which are labelled as being beneficial but they are still oils. My feeling is that the WHO keep moving the goal posts in what is okay or not okay to consume. Oil is oil and if you heat it, it changes its structure, which may be bad for us. Maybe these oils should not be used at all to cook with, or maybe use a light spray of olive oil or even a small amount of butter instead. Use the cold pressed virgin oils as a food over salad etc and not use these for cooking. I don't think using goose fat or lard is good because it is high in saturates but agreed it does produce lovely roast potatoes!! It is the same with wine. It was in the news recently that red wine is bad for us yet the grape is full of antioxidants and it is those antioxidants that help reduce the bad free radical oxygen molecules in our bodies, so a glass of red wine with a meal must be okay then?
It is a bit of a minefield out there and one has to be sensible and do some research but not become too paranoid. Reducing the fat off meat will also help reduce the trans-fats too. My grandmother and mother used to cook with what is regarded these days as all the wrong ingredients yet they lived to a good age with really no real health problems. I feel that since around the middle of the 1900's our food industry has changed dramatically. It now produces more and more refined and processed food. The agriculture and farming processes have also dramatically changed. The chemical changes that have been given to our meat industry over the past years have now worked there way into the human body causing in my opinion changes in our chemical make up.
In the long term it would have not been known how these processes, that the farmers, food and the medical industry carried out, would affect us in the future. I am sure that no real danger was or is intended from 'improvements in technology' to our food
.A way of feeding the world is now becoming a real problem so more and more deviation from the real natural food is inevitable. This is why today, more people are becoming ill with, in some cases mystery illnesses. Our bodies are just chemicals ordered in a way to make us what we are. It is shown that by altering just a simple chemical molecule it can cause cells to become dysfunctional. It is about being educated but also a need for the real truth of what we are consuming and that is difficult to find out there.
Doctors don't seem to help as they have their own ideas and stick to what the WHO have said. So we are left with forums like this, which give various opinions for us to further ponder on.