If you are contemplating getting this book, get it from the library or wait for the paperback version. (unless you like paying for hardback books) The formatting for this book does not translate well to Kindle.
That said:
Diet = food that you eat, at given times of the day.
This was a pretty decent book. He takes a lot of well known dietary foundations - Carb cycling and leptin balancing in particular, and applies them to weight loss and adrenal function. My reason for reading this book was for the Adrenal aspect, not the weight loss. My only comments on the weight loss concept is "of course". Of course eating real food, not processed crap will help you lose weight. Of course a high protein breakfast and complex carbs lunch and dinner will help you lose weight. This is not news.
What was more interesting was the tie to adrenal function. If you have adrenal dysfunction you well know how the highs and lows of your day goes. What Mr. Christianson has put together shows that with a specific set of macro nutrients, the circadian rhythm resets to a "proper" diurnal setting. Cortisol peaking in the morning, declining through out the day, with it's low point deep in the night. He showed this with people with improper peaks, and people with flat slopes. So if you've done the work, you've cleaned up the gut, you have killed off microbial pathogens, rebalanced methylation, reparied the serotonin and dopamine pathways and you're still stuck with improper cortisol peaks, energy crashes, insomnia and shifted sleep patterns, Following the simple steps laid out in this book is well worth the minimal effort.
Case in point, this is where we are stuck, with a cortisol pattern peaking improperly, disrupted, shifted sleep, low day time energy and brain fog. We made the first simple change - Eating breakfast within one hour of waking, high protein, low complex carbs, on a Wednesday. On Friday we saw stable energy through out the day, less brain fog, and less depression. That's a pretty darn fast turn around. We will be working out the rest of the daily meals as we go along.
This is an easily adaptable protocol, regardless of if you follow GAPS, Paleo, BED, SCD or any host of other gut healing modalities.
My remaining question is around different metabolic types. He sticks to a very set marcro-nutritent ratio and a low fat paradigm. If weight loss is not your goal, can the ratios be shifted for more optimal personal nutrition? It is one of the things we will be working out.