Those who move and care for their bodies and thus stay young as long as possible normally live to an old age.
But this does not seem to apply to the intestinal flora.
If we want to grow old healthily, it should better not be what it was in our youth.
It sounds paradoxical: every human being - whether big or small, young or old - consists largely of non-human beings. Because around 40 trillion bacteria populate his intestines, that's about ten trillion more than his own body cells. That this army of foreigners can have a positive influence on the health of its host is obvious and has been proven many times. But studies also show that the intestinal flora must be flexible for this.