There are two negative things that could've made this book a 3 star book very easily, but there's one thing that made it worth 4 stars.
I will begin with the positive. Melissa and Dallas Hartwig in this book provide a positive, clear, practical guide to eating and nutrition. Their 'diet' is called the Whole 30, and it consists of eliminating any and everything that might cause you bodily troubles, especially inflammation. That means dairy, legumes, alcohol, processed carbs, gluten, soy, vegetable oils, and surprisingly, all grains. You are supposed to eat a lot of healthy fats, animal meats, vegetables (potatoes actually fall here and are allowed), and even some fruits.
So why is this so revolutionary? Well, in one sense it isn't. They're basically just eliminating all the negatives. But in another sense it is because it allows you to really then see what bothers you, and to what degree. They don't fall into the unscientific low-fat craze. They don't think saturated fat is bad. They see clearly the dangers of processed carbs. And they then think that for 30 days, you should just only eat what we know is good for you. They back this with research, it makes sense, and it has testimonial support.
So this Whole30 plan and idea is enough to give this book 4 stars. They explain it well. It makes sense. And it is backed with much research and testimonials.
So what are the two negatives I saw that almost made me rate it three stars?
First, it just isn't well written. I am actually not a stickler for 'good' writing—especially because I don't even know how I'd define it. However, I think it is sort of obvious when you encounter less-than-good writing. And I think this book falls into this category. The way they write, how they emphasize things, and even how the book is formatted (with sporadic paragraphs and lines scattered throughout the pages) all leads to the conclusion that it just isn't good writing. If you compare this with Dave Asprey's book The Bulletproof Diet (in which he advocates for many similar nutritional ideas, and also uses many studies) and you'll see how it could've been written so much better.
But coupled with the poor writing is the extreme rigidness of the plan. Now I know, they rightly say that doing this isn't 'hard.' After all, we can control what we eat. But then comes the big deal-breaker, namely, eating out or anywhere besides your home. They advocate to not look for the perfect months, and to just do it for 30 days, because no month will be perfect. But what they don't warn about is how near impossible it is to eat out. And I mean impossible. The only thing we could find (if you search the Whole 30 forum, you'll see what I mean) is eating at Chipotle. But not just anything at Chipotle, but only their pork (as everything else was cooked in bad oils), with a bed of lettuce, with pico de Gallo and guacamole. That's it. Besides that, there is no where we found we could eat out. Couple that with traveling anywhere or eating with any other people, and it is nearly undoable.
So my wife and I are planning on doing this maybe in January when we don't travel and don't need to eat out. But we'll see.
But overall, the nutritional info in here is good. I think their ideas about things can be good. But in the end, it is far too strict. I know it is only supposed to be for 30 days, and in the second to last chapter they talk about how they don't want you to be this strict forever, but they could've given more on this.
Would I recommend the book? Yes and no. Yes, the Whole30/Paleo/high-fat/less-vegetable-oils/less-refined-carbs idea in nutrition I think is right and backed by science. So if you're looking for info on this, this is an okay place to look. But no, because of how poorly it is written, and because of the difficulty of the diet. It's one thing to talk about the strict 30 day commitment, but they could've had much more about long term living.