There is no single recommended IBS diet, states WebMD. An IBS diet is highly individualized and what works for one may not work for another. However, following general guidelines, such as avoiding certain foods and eating smaller, more frequent meals can alleviate one's symptoms.
Foods to avoid for people with IBS include spicy foods, alcohol and foods high in fat, such as fried foods, states WebMD. Other foods, such as onions, peas, bagels and cabbage, can cause significant discomfort in people with IBS as well.
For people suffering from constipation with IBS, trying a high-fiber diet may help, according to WebMD. IBS sufferers should aim to eat 25 grams of fiber daily for women and 38 grams of fiber daily for men. If a person is unable to eat the recommended amount of fiber, then she should eat as much as she can tolerate.
The FODMAPS diet plan may also be helpful for IBS patients, states WebMD. This plan is usually effective for people suffering from diarrhea as a result of IBS. In this diet, the patient usually works with a dietician to remove all foods that contain the five types of carbohydrates: lactose, fructose, sugar alcohol, fructans and galactans. The patient follows this diet for one to two weeks, and if one of the above carbohydrates is causing IBS, then IBS symptoms can disappear in a matter of days.