Low carbohydrate training will shift the body's primary fuel source from glucose to fat. That's what I've been doing for the past six weeks. I have read that book also. This is what I got from it.
QuoteSports Implications The direct metabolic benefits of keto-adaptation translate into two general effects relevant to most athletes.
Improved body composition (power-to-weight ratio).
Improved prolonged endurance performance resulting from better sustained fuel delivery.
However, as you said the book also states.
QuoteAlthough genetically lean people as a group may respond differently, when overweight humans do more than one hour of endurance exercise daily, resting metabolism on average declines between 5 and 15%.
I was not aware of that and didn't remember reading it.
From that, and other sources I've read, I've come to believe that one can minimize any metabolism reduction during weight loss, either with or without exercise, using a very low carbohydrate diet. There is a long explanation behind that but it amounts to a lesser reduction in overall calorie intake combined with the body's ready access to stored energy (fat). The result is that the internal hormonal regulation systems do not get signaled that there is a famine underway and it therefore doesn't need to do whatever it can to preserve energy. So the metabolism theoretically remains elevated.
So, the lesson learned is that weight loss is a result of diet and that one should exercise for health and fitness but not for weight loss. Pick a sport or exercise because you enjoy it.
There was a time about four years ago when I was running 10 to 15 miles a day and lifting heavy weights three times a week. A lot of exercise; too much in fact. During that time I gained nearly eight pounds. I also crashed my endocrine system. That took nearly a year to recover from but it was a catalyst to face this trans thing head on instead of once again trying to hide from it through exercise induced exhaustion.
Conform and be dull. —James Frank Dobie, The Voice of the Coyote