It's a great article, Jim. Thanks for highlighting it
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This chap has not really understood the nature of why people become overweight, and struggle to lose and keep off the excess weight. It is too simplistic to suggest that it is because they eat too much, because that is obvious. The problems start when people start to use certain foods to make themselves feel better, to numb feelings etc.
These habits will develop over time, and will refine and establish themselves as we continue to diet, overeat, diet, overeat over the over again. Each failure making way for the next attempt.
If this chap approaches this 'weight-gain weight-loss' challenge in a professional capacity rather than drifting into it like most people and getting hooked, he is unlikely to learn a lot. I hope he has a real struggle to lose the weight though, because he will hopefully get some insight into the struggles of his clients.
On the other hand, I would not wish that struggle on anyone.
AJ