No. We only excrete urine through our pee. This is basiclly nitrogenus waste. Everything else, dead cells, parasites and the food types you can't physically digest (green things etc) have to come out the tradesmans.
If you have a protein rich diet, you will shit less but it will come out like black matter, really smelly solid poo, I don't know if you've ever had too much biscuits brown (I swap my minging meals for buiscuits brown) and then had a really smelly post-ex shat, but it's like that.
whatever protien isn't used, plus dead cells etc needs to exit via the rusty bullet hole like it or not.
funnily enough we have been talking about this today with aussie and brit colleagues.... in Aus you can buy space food (I said we lost our space rocket so we dont bother with the meals) ....
so what if you ate one of those 'space man' bars which are basically just energy and protein etc - if you used up all the cals presumabley you'd do a little bunny rabbit size pooh whcih even a broken space station toilet could probably cope with.
No bags for them - here we have the most expensive toilet ever built (and this is the second one - so they have a spare):
A NASA spoke woman said that paying 19 million U.S. dollars for a Russian-built international space station toilet system is a bargain compared to building one from scratch. The toilet system, similar to the one already in use in the station's Zvezda Service Module, is scheduled to arrive at the space station in 2008 and will offer more privacy for a crew expected to double from three to six by 2009. Another plus is astronauts are familiar with how it works because it's similar to one already in place at the space station. The space station toilet will be installed on the American side, and the current toilet system on the Russian side will remain in place.
The space station toilet physically resembles those used on Earth, except it has leg restraints and thigh bars to keep astronauts and cosmonauts from floating away. Fans suck waste into the commode. Crew members also have individual urine funnels which are attached to hoses, and the urine is automatically transferred to a U.S. device that can generate potable water.