Thank you for the insights.

I have read most of what Dr Fung has written. With his references to research results, he has proven to my satisfaction that the culprit is insulin. He has proven to me that the level of insulin determines body weight and the body will do whatever it takes to make it so, in the long term. Therefore, anyone with a weight problem has an elevated insulin problem (ie. insulin resistance).

As Dr Fung states, a LCHF diet will maintain glucose and insulin levels, and even prevent worsening, but will not reverse any insulin resistance in the short term. However, if insulin resistance took 20 years to develop, an LCHF diet will reverse the resistance but will also take 20 years.

Fasting is required to reverse insulin resistance on a shorter term. However, Dr Fung does not give a time span.

It would be interesting if anyone knows anything more about this.