General answer? I doubt anybody knows, I’ve looked all over for the answer to this question.
The best answers you will find is looking at astonaut studies. Some of them have shown people to lose an incredible amount within a week.[/quote]
Why would you be looking all over for a general answer of how long muscle mass stays around without any continued stimulus? The “general” answer is it won’t stick around long if you aren’t eating enough to support it or lifting weights heavy enough to cause it to remain.
How long that is exactly would be based on the individual, their diet, their age and too many other factors to put a specific time limit on. It would vary from person to person meaning you wasted a whole lot of time in your search for the one right answer.
One thing we do know is that you won’t gain 50lbs of lean body mass, quit working out and keep all of it it 5 years down the road. Genetics would also be a huge factor as far as how much lean body mass remains. This question is generally asked by people who lack motivation and are hoping they can lift weights real quick for their beach vacation and then quit working out again.