Thanks for the query to H.C.M. Forum.
As you mentioned that immediately after meal you have to go for diarrhea
After meal ingestion,colonic phasic & tonic contractility increase for a period of approximately 2 hours. The initial phase ( about 10 minutes as you stated in your case) is mediated by the vagus nerve
in response to mechanical distension of stomach.
So this is the main point that vagus nerve stimulated due to stomach distension immediate after meal.
This increase the motility of intestine and there develop diarrhea .
Since this is from 4 years after birth of your child . May be due to ,
1 Secretory causes , diagnosis can be confirmed by examination of various electrolytes . As electrolyte imbalance
is the main cause in this group.
2 Osmotic causes osmotic diarrhea occurs when ingested carbohydrates develops allergy
. Diagnosis can be confirmed by physical as well clinical history of patient so consult a physician and get his opinion.
3 fat malabsorption
is the another cause after gall bladder
So in my opinion consult a gastroenterologist
and get his opinion.
Till use banana , rice fat free cured, luke warm water.
Good luck. Dr. HET