OK, this is my umpteenth book on health and nutrition (and life after a low carb or ketogenic diet), so I am getting a good idea of what more authors think apart from the ones strictly devoted to the low carb/keto/paleo cause. And this is what I think: this book is a good read, do give it a try, especially if you're struggling with a sluggish metabolism since going low carb/keto and especially if you are clinically hypothyroid. But do take the book and the author's recommendations with a pinch of salt and do make sure you read more books and authors, for example Paul Jaminet's "The Perfect Health Diet".
What I find positive about this book:
- Kate Deering takes her time to explain the science behind Ray Peat's and her own diet recommendations, but my opinion, based on other sources I have read, is that at times the explanation can be flawed, so do read it critically. For example it is stated that all cells can utilize fructose, because fructose does not require insulin to get into cells. This is simply not true. Fructose can only be metabolized in the liver where it is converted to glucose (which can then be used as fuel by all cells or stored) or fat.
- She recommends everyone step away from low carb or keto diets and go for a high carb (and relatively low fat) eating plan - this can be viewed as both a good idea, since many lowcarbers definitely feel better on a higher carb diet, and a bad idea, since there might still be many people who can't thrive on a high carb diet. But to help everyone minimize any negative effects, she recommends carb intake be increased very slowly, and this is definitely good advice.
- This is yet another book that tells us that PUFAs and a high muscle meat intake are bad, while saturated fat, cholesterol, salt, coffee, gelatin/collagen/bone broth and organ meats are good for us. Hallelujah! We need more books with this message.
- Fruit, even fruit juice, is exonerated. Yaaaaay! Lowcarbers could definitely benefit from adding more whole fruits to their diet.
- Dairy is vindicated as well. Thank God for that.
- Starch (except for white and sweet potatoes) and grains, as well as nuts and seeds and legumes (especially soy) are condemned. This message is not new, of course.
- Emphasis is on healing and not on weight loss.
- Readers are encouraged to eat more and exercise less. Hallelujah!
- The importance of balancing blood sugar (by eating the right kinds and amounts of carbs, combined with protein and fat) is emphasized - always a good idea.
What I find negative about the book:
- The message to drink a lot of milk and fruit juice and eat more sugar than most authorities would advise still seems suspicious to me. Then again, Kate Deering urges her readers to take it slowly and observe how their body responds.
- Having read the Jaminets' defense of starchy foods, I am slightly suspicious of this almost total condemnation of starch. People have been consuming (safe) starches for ages, they can't be that bad. On the other hand, I do agree that even starch intake should be moderated.
- The thing that bothers me the most about this approach is that you are still advised to count calories, even though you are allowed to eat more.
All in all, my opinion is much more positive than negative. But even if a low carb diet can be harmful for many people long term (and beneficial for others), do take it slowly, when you start increasing your carb intake. As with many things in life, your mileage may vary, so make sure you read your body's signals right and do not dismiss them.