You can check that via supplementing enzymes (and HCl) for a while.IME, there absolutely can be waste from animal foods, especially with dairy since as Ray has even pointed out, its very nature is bulk forming. From the Ray Peat email exchanges:
"They aren't necessary [FIBER], for example milk supports abundant bacterial growth that creates bulk, but when there are digestive and hormonal problems because of bad intestinal flora, the fibers of carrot and bamboo shoots have a disinfecting action. The carrots must be raw for that effect." RP
Despite three days of nothing but water following the end of my time on a carnivore diet, I was eliminating a lot of backed up waste and feeling relief from constipation, something I'm all too familiar with. I'm not the only one who shares a similar experience which again is why I asked if digestion is a factor with body odor. Does someone who has a strong pancreas, thyroid, adrenals etc. have better enzyme and stomach acid production to break down animal protein, as well as stronger peristalsis for elimination, so that less food is sitting in the intestines feeding microorganisms, stressing the liver etc. and possibly causing an odor as a result? We have multiple people here who share a different experience with the same food -- some get an odor with dairy while others don't. Given I had a more pronounced odor while consuming nothing but milk, red meat wasn't a factor in my case.
Unless I were to fast or drink nothing but filtered juice for an extended period of time, there will always be food in my intestines so I'd rather be eliminating multiple times a day than holding on to it for days. The latter was not normal or healthy for me but if you say it is for you, I believe you. You know your body best. :)
Stool is mostly water, dead bacteria, and discarded stomach lining. And fiber.