I think this is an example of overly pushing everything to the demand of science.
It obviously depends on your body, diet, and microbiome.
There's no definitive answer like if Earth was balls around the Sun. The answer is personal. Does that work for you or not? What have you tried and what works and what doesn't
I think the problem is that everyone knows “that person” who thought they didn’t need soap/shampoo etc. but it turns out they just have a terrible sense of smell and are deluded
Like the friend of mine who told me she never used shampoo in which my immediate reaction was “no shit..”
On the flip side, I do have a close friend who admitted he only showers every three days or so, and smells impeccable (which is extra funny because he has anosmia)
It obviously depends on your body, diet, and microbiome.
There's no definitive answer like if Earth was balls around the Sun. The answer is personal. Does that work for you or not? What have you tried and what works and what doesn't