Which book was it?
After a lifetime of thinking that diets had to be permanent and results were only possible through hours of exercise this book turned me around. I lost 50 lbs in eight months and haven't looked back.
On Good Calories, Bad Calories, I was convinced by the critique of the mainstream but not by his alternative proposal.
Did you catch Leo Laporte / Steve Gibson (ala Security Now) covering LCHF diets a few weeks ago?