FYIThis is one reason why a lot of IBS sufferers sometimes think that a particular food is the culprit to symptoms."gastrocolic reflexThis is the reflex system that tells the colon to empty when food hits the stomach, or even in anticipation of a meal. This is why baby poops every time he nurses. It is also why kids with constipation complain of their belly aches right around mealtime. ""Medical Dictionary Definition: increase of muscle movement in the gastrointestinal tract when food enters an empty stomach; may cause the urge to have a bowel movement right after eating. "In IBS this reflex is exaggerated."Why Symptoms OccurDuring normal digestion, foods are broken down in the stomach and small intestine so that their nutrients can be absorbed into the body. Undigested or partially digested portions -- mostly in liquid form -- then enter the large intestine colon where most of the water is reabsorbed. Movement through the intestines results from peristalsis, a wavelike contraction of muscles in the intestinal walls that propel their contents forward. When all is well, the end result is stool that is solid but soft enough to be excreted easily.Diet, eating habits, stress, and various environmental factors can disrupt the normal function of the intestines. If the intestines squeeze too hard or not enough, the partially digested food can travel too rapidly or too slowly through the digestive system. Movement that is too fast will result in diarrhea, because not enough water is reabsorbed. Movement that is too slow can result in constipation, because too much water is absorbed. Overly hard squeezing (spasm) can result in cramps. However, the diarrhea of IBS can also occur without pain.IBS symptoms occur after eating because of the gastrocolic reflex -- increased movement of the intestinal contents in response to food entering the stomach. The strength of this reflex can be influenced by the volume and temperature of the food and the number of calories. Large meals particularly high-fat meals and large amounts of cold beverages can trigger IBS attacks." http://www.quackwatch.org/03HealthPromotion/ibs.html
more"Physiological Differences in IBS Patient SubgroupsThe gastrocolic reflex, a partly neurogenic process, refers to an increase in colonic motility induced by feeding. Postprandial deviations from the normal motility patterns lead to altered bowel habits. For example, a spastic colon eg, diarrhea-predominant IBS D-IBS is characterized by an exaggerated motility response to food intake. This exaggerated postprandial response also occurs in response to intraluminal distention or to an injection of cholecystokinin CCK -- a hormone released in the duodenum in patients with IBS." http://www.medscape.com/viewarticle/418586_2
I am not a doctor. All information I present is for educational purposes only and should not be subsituted for the advise of a qualified health care provider.
Please make sure you have your symptoms diagnosed by a medical practitioner or a doctor.