Michael Hass:
In my 20s I weighed 67-68 kg (150 lbs). After steadily gaining weight over the years, at the age of 50 I weighed 86 kg (191 lbs). After applying the method described in this book I lost 18 kg (40 lbs) in only 18 months, getting back to my weight from when I was in my 20s. And I have kept that weight ever since, almost 10 years now.
If you think that sounds like hard work, like I must...