solaros
Lyle McDonald: I want to make it absolutely clear that I'm not suggesting that the body is somehow going to violate calories in versus calories out due to stubborn fat. Rather, what can happen is that where the body pulls those calories from (to cover the deficit) which has to do with calorie partitioning (where the calories go or come from when you gain or lost weight respectively). And, ignoring the contribution from glycogen stores, let's keep it simple and say that the body has two places to pull calories from when you diet: fat cells and skeletal muscle.
Now, think about a situation where there is tons of fat available for fuel such as extreme obesity. Short of some truly idiotic approaches, what you'd expect to see is that most of the weight lost will come from fat with little from muscle. And this is exactly what happens.
But now consider the opposite situation, where there is little or no fat available for fuel. If the body still has to cover the caloric deficit (from diet, exercise or both), what does it have to do? Break down muscle. And, as everyone who's dieted to extreme levels of leanness knows, muscle loss accelerates as folks get leaner.
Now, I'd note that there are a whole host of physiological reasons (involving hormones such as testosterone, cortisol, etc.) involved in this. But an inability to mobilize fat for fuel (which is more difficult as you get to the 'stubborn' areas is probably part of it. Simply: if you can't get the fat out of fat cells to cover the deficit, the body will go looking for another source of energy and that's usually skeletal muscle.
Now, think about a situation where there is tons of fat available for fuel such as extreme obesity. Short of some truly idiotic approaches, what you'd expect to see is that most of the weight lost will come from fat with little from muscle. And this is exactly what happens.
But now consider the opposite situation, where there is little or no fat available for fuel. If the body still has to cover the caloric deficit (from diet, exercise or both), what does it have to do? Break down muscle. And, as everyone who's dieted to extreme levels of leanness knows, muscle loss accelerates as folks get leaner.
Now, I'd note that there are a whole host of physiological reasons (involving hormones such as testosterone, cortisol, etc.) involved in this. But an inability to mobilize fat for fuel (which is more difficult as you get to the 'stubborn' areas is probably part of it. Simply: if you can't get the fat out of fat cells to cover the deficit, the body will go looking for another source of energy and that's usually skeletal muscle.
"Cóż jest trucizną?
Wszystko jest trucizną i nic nie jest trucizną, tylko dawka czyni, że dana substancja nie jest trucizną!".
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Cayek
wieczna redukcja
