"Are enemas really healthy for you."
As a holistic critical care nurse, i may read that question differently than the general populace, though i imagine many here have a more inclusive way of looking at stuff.
"Healthy" is more than physical, and there are a lot of people who meet psychological and 'different' physical desire and need, through things that may not be how the body is generally adapted. Science, on topics like physiology, is not absolute, it's just the best we know so far. The body is an infinite universe, and though we may know a lot, taken in context of "infinity," it gives one perspective. For those interested in evidence based gut health, i'd recommend: "Fiber Fueled" by W. Bulsiewicz or "The Microbiome Solution" by Robynne Chutkan. Both are current and excellent reads with lots of research and science to back up the info contained therein.
I've written this in other threads, but our gut is not a sterile environment. We have 10x more bacteria living in our gut than we have cells that make up our entire body. Enema sort of turns our anus into a mouth and we are 'feeding on' or 'eating' whatever we put in there. It's sort of a different way of 'eating' because we have about 27 feet of intestine, about 23 feet of small intestine and about 4 feet of large intestine/colon. We are only effecting/feeding the last 4 feet, the colon/large intestine, with enema. Nutritionally speaking, a large part of that happens in the small intestine, and enema doesn't affect that. The large intestine/colon happens to be where the majority of the micro biome resides and enema is putting something into that part of our body and bypassing the preceding processing part of the digestive tract. i think it's fair to state the body is more adapted to eating than it is to enemas, which is not to argue for or against, just a factor.
We affect the micro biome mostly by what we eat, but also in other ways. For instance, we often blitz people with antibiotics to save them from death from sepsis. When they come into the hospital with suspected sepsis, we get a lactate level. If it's >2, we typically implement sepsis protocol that involves getting blood cultures, infusing fluid bolus' and starting broad spectrum IV antibiotics. "Broad spectrum" because it takes 24-48 hours for cultures to grow, but in 2 days a person can die, so we treat presumptively. The broad spectrum antibiotics kill indiscriminately, hopefully the infective pathogen, but also does a number on and alters the good bacteria in the colon. People on long term antibiotics frequently get fungal infections or C. diff as a result of an altered microbiome... i.e., we've killed off beneficial bacteria that we live in symbiosis with that keep those things in check normally.
One of the most effective treatments for C. diff is a 'fecal implant" where we essentially give a fecal enema to the sick person with feces from a healthy person to restore the accompanying beneficial bacteria from the healthy persons feces into the 'disinfected' gut of the person with C. diff.