good point...
why would you biologically hold onto muscle that is not needed as not as much tension
right this is where optimal diet comes in along with b-vitamins, flaxseed, skim milk, fortified cereal, applecider vinegar
the only way to biologically maintain or gain is to put the stress on and progessing upwards especially big guys with big muscles who also carry good amounts of bodyfat
much better to attempt to build more muscles with high calories and more average tension ensuring lean mass sustanance while leaning out WITH OPTIMAL CALORIC CHOICES