We need to talk about your poo...
Not the easiest conversation in the world to have with someone you just met, but it has to be done. Especially now that we know that a healthy stool is associated with the presence of beneficial microbes and higher species richness.
There are a few things that can impact stool frequency and consistency, such as antibiotics and pathogens, when looking at the chart you should be choosing your 'normal'.
If you do happen to get a bout of diarrhoea, consuming prebiotics and probiotic-containing food can help minimise it's duration and help restore your gut microbiota back to normal sooner.
Alterations in the gut microbiota as a result of dietary changes are much faster than you would think. Consider that bacteria multiply very quickly in ideal conditions such as inside the human body - each bacteria can split into two approximately every 20 minutes. You can see how changes can easily occur within 24 hours.
The faster you feed your 'good' bacteria, the faster they will displace any pathogenic or 'bad' bacteria and get you back to good health. So get into the Greek-style yoghurt, fermented food & beverages, inulin-containing foods (unless you have IBS) and dietary fibre in general as soon as diarrhoea rears it's ugly head.