I recommend just trying it out. Pick a day when your performance doesn't need to be perfectly top notch (though it probably won't suffer anyway.) And then just

I recommend just trying it out. Pick a day when your performance doesn't need to be perfectly top notch (though it probably won't suffer anyway.) And then just commit. For me, that was not bringing lunch to work: just my water bottle and thermos of black tea. I found no difficulty working out that day or the next. I'm 6'0", 250lb., with certainly too much fat, if that context helps in any way.