subject: When Should You Eat If You Have IBS? [print this page] It is also important for you to split up your meals into smaller batches if you are having a difficult time with diarrhea. Many times, just eating smaller meals throughout the day may be enough to help you to overcome a problem with diarrhea. The opposite, however, is also true and if you are suffering from constipation as a result of your irritable bowel syndrome then you might want to eat three larger meals every day and include plenty of natural fiber in those meals. This is often enough to cure the constipation and to get things moving along properly again.