I rarely review books that I do not particularly enjoy, but I think I must do it on this occasion to help some people get what they are looking for.
Firstly, it's not a "book", it's a transcript of 3 lectures given from 1959 to 1972. They are virtually unedited and printed "as is". As you can imagine what was the revelation in 1959 has been researched much further later on. It does not diminish author's achievements, who was a true pioneer in the field of oil research, but if you have read a lot of recent studies on the subject, you will find not much new information in this book.
My major reservation though is that one might get an impression after reading this book that just by adding flax oil with cottage cheese to one's diet will heal you from serious diseases like cancer (author does not say so explicitly, but those anecdotal evidences she refers to suggest so). Flax oil is very beneficial and may help in many cases, but it should be done with many other steps to make effect. Avoiding toxic foods (not just "bad" oils) would be absolutely necessary, and then many others to cover in a short review... And definitely milk products would fall into products one should try to avoid, especially for cancer patients.
The other criticism is the translation. Original lectures were given in German and were translated by a non-English speaker which makes them very hard to understand sometimes. I.e. a sentence that is repeated several times "Isolated fat, a clear "No!" to this substance." - I can only guess what it means. I am not fussy and can understand when "worlds" is used for "words" but then considering it is a 3rd edition, it could have been proofread and maybe edited by an English editor in the process. This is not an easy subject to understand and clear translation would definitely help.
I absolutely agree with author's statements that (most) saturated fats are bad for you (except Coconut oil) and (most) unsaturated fats are good or better for you (in moderation), but, unfortunately, the book does not provide any references to actual research, just anecdotal evidences. Personally I did not need convincing what bad or good oils are, I was hoping to find some sound and quantified scientific evidences from what is a leading scientist on the subject, but suppose it was the accepted manner of giving lectures at the time. Just not what I was expecting.
Overall, if you are a layperson looking for a health advice for the diseases mentioned in the subject, or want to learn more about healing properties of oils, I would recommend looking for some other books. A. Moritz, Bruce N.D. Fife, and Udo Erasmus would be a good start.
Hope this review helps someone.