Uhhh…he seems to be omitting a lot of science in order to support his love affair with fasting.
Fung:
"Now, the situation for the obese, leptin resistant person. As you eat lots and lots of fat, insulin does not go up. However, that ‘fat bomb’ does indeed go directly into your fat stores. You respond by increasing leptin levels in your blood. But here’s the difference. You body don’t care. It’s resistant to the effects of leptin. So, your metabolism does not go up. Your appetite does not go down. None of the beneficial weight loss effects of eating that ‘fat bomb’ happens. And yes, you will need to eventually burn off that extra fat you’ve taken in."
One of many, many other guys:
"We all know that the commonest lab finding in people following a low-carb diet is a dramatic reduction in triglyceride levels. This reduction in triglycerides allows the leptin that is already circulating in relatively large amounts to get through to the brain where it can reduce hunger. I believe that this reduction in triglycerides (which happens fairly quickly) is the primary reason that people substantially decrease their hunger on low-carb diets. And remember from the graphic above that leptin – once it gets to the brain – actually increases thermogenesis as well, which means that the metabolic rate increases."
My hunger went way down on LCHF. I crave mostly fat but in smaller quantities–exactly how LCHF is supposed to work. So, you can pry my fat bombs from my cold, dead hands, little Fungster.