Hi, I had gone through your queury and understand your concern.
Brief answer:The reason of recurring loose motion
may be due failure of maintaining proper food and water hygiene as well as personal hygiene.Another reason my be the use of unsuitable or resistant drug.
Detailed answer:The best thing for preventing diarrhea
is to eat safe food and to drink safe water.Moreover,one should maintain personal hygiene like washing hands with soap and water before eating and after defecation etc.
Since you have been suffering frequently from diarrhea,I would suggest you to consult with a physician and get a stool R/M/E.
Hope this helps you.
Wish you good health.