Originally Posted by lin43
Thanks, John. How long is "too long" (estimated) and how low is "too low"? I guess my last question here pertains to my original question.
You're asking an extremely complex question but the very simple answer is that the more fat you have the longer you can restrict calories massively without muscle being catabolized assuming protein intake is sufficient.
It comes down to energy. The energy needs of the body must be met. If the body can't meet them from fat it will take what it needs from muscle.
Also the body adapts. If you're not using muscles you will lose them and you'll lose them faster when dieting.
Bottom line is most people don't need to worry about this because they have plenty of fat to meet the energy needs of the body.
Just use your muscles and get adequate protein. If you get adquate protein you're probably also going to be getting enough calories because most people aren't going to want to eat meat only.
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Maintaining for two years and I eat whatever I want - just not however much I want. Details here.