I noticed that a few of the residents in the care home did this from time to time but only for a couple of days, some did it regularly, some just now and again, then one day my wife did it so I asked the nurse what the problem was.
She said it was constipation, gave my wife about 10 or 20 ml of some clear liquid and the next day she was better., the way the nurse said what it was implied it was common knowledge.
I've no idea what the science behind it is but whatever they gave her worked.
On reflection over the years my wife did sometimes say she needed to eat fruit and sometimes she took Fibregel (if that's what it's called) so I guess she was managing constipation and when she became ill she stopped doing it.
The home aren't allowed to give the residents any medication that's not on prescription even paracetamol but they are allowed to give this laxative without calling the doctor.
K