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I believe Udo Erasmus is a knowledgeable person about health aspects of fats and oils. And Choosing the Right Fats provides a scattering of true and useful information. Someone who knows very little about the subject can possibly profit by reading it.
But this is not a book to buy, for reasons that I will explain. Not even one of the 34 used ones available as I write for $.01 + S&H. See below for an alternative recommendation.
FIRST, the book has precious little content. It is listed as having 64 pages. Thirty-five of those pages include relevant text. (The other twenty-nine pages are devoted to nine recipes that have at most a tangential relation to the subject.) Parts of the thirty-five relevant pages are occupied by 19 pictures, none of which add useful meaning, pages 24 and 35 contain what I regard as useless information (testimonials from athletes, and a long story of a racehorse in Sweden helped by recommended supplements), page 18 is essentially an ad for a weight-loss service offered by, apparently, one of the author's relatives, and half of page 37 is essentially an ad for a particular brand of kefir-maker (kefir is sorta like yogurt). That is to say, this $9.55 book doesn't have many useful words in it.
SECOND, there are many signs that the book was thrown together hurriedly with a virtual absence of editing.
For exampe, p39: "Symptoms of excessive intake can drowsiness, include and stomach upset. Too much oil on an empty stomach can cause nausea, the liver is reaction to over indulgence."
More important than such infelicities is that the book sometimes contradicts itself. For example, page 29 says, "Most adults require between 2 and 5 tablespoons (30 and 75ml) of oil blend per day...", while page 32 recommends "30 - 75 ml per 100 pounds (45kg) of body weight per day". Since most adults weigh more than 100 pounds, and many weigh over 200 pounds, this is an important discrepancy relating to a basic matter. To add to the confusion, page 40 says, "Use one to four tablespoons per day of the oil blend...".
THIRD, the book as a whole is essentially an advertising brochure for a line of the author's products offered for sale by a commercial company. There is essentially NO information that would help an individual select or obtain healthful fats and oils other than by buying the featured products.
So what does the book have to say that is useful?
It points up the omega-3 / omega-6 distinction, testifies that the distinction is important, recommends intake of n-3/n-6 at somewhere between 2:1 and 1:4, and tells that most Americans have intakes in the range of 1:10 to 1:20, a fact underlying much chronic disease. The book makes many claims for the benefits of correct essential fat intakes. Here is one that I can testify to personally: "The n-3 essential fat lowers high triglycerides (blood fats) very effectively, by up to 65%, which is better than any drug sold for lowering them."
Unfortunately, other than hawking the author's products, the book tells little about what to do. My own belief is that Erasmus makes a fundamental error in separating his healing oils from their natural nut and seed substrates. One reason is that the oils, especially flax oil, require great care to prevent going rancid (a point Erasmus himself emphasizes). Another is that in nature the oils come packaged with other nutrients, and I prefer to use the original whole foods rather than Erasmus' fractionated, processed ones.
This means using flax seeds (cheap and shelf-stable) rather than flax oil (expensive and very unstable), and pumpkin seeds, sunflower seeds, etc, rather than their respective oils. I use a small electric coffee grinder (the kind with a whirling blade) to grind small amounts of seeds just before eating them (mixed with fruit or yogurt, etc).
And it means eating canned salmon and sardines to get long-chain n-3s rather than depending entirely, as Erasmus does, on short-chain flax oil. The body can convert short-chain to long-chain, but the conversion is often insufficient, and the long-chain forms (EPA and DHA) are what the body uses and needs. I recommend any canned salmon labeled "Alaska wild caught" and sardines packed in water, olive oil, or, if you can find it, sardine oil. Avoid other "flavors" of sardines, especially those in soy oil, which is heavy in n-6, and watch for heavy excesses of salt in some brands.
I find it quite astonishing, and regrettable, that, after more than a decade, Choosing the Right Fats is still in print. I think both the author and the publisher (Alive Books) should be ashamed of themselves. For a much fuller and higher-quality discussion of this whole subject, I recommend the relevant sections of The Perfect Health Diet by Paul Jaminet and Shou-Ching Jaminet.