Visit 5: The subject will give the study coordinator their 3-day food diary and the daily and weekly IBS symptom diary. The physician will review their IBS symptom diary and ensure there are no significant adverse events. The physician will do a physical exam and take their vitals (such as weight, waist circumference and blood pressure). The subject will then be asked to fill out questionnaires relating to their IBS symptoms (IBS-Quality of Life questionnaire (IBS-QoL) and IBS Questionnaire by Whorwell and Francis) and the 34-item tool asking about their GI symptoms and severity. Next, they will have 2 tablespoons of blood drawn by a certified nurse or medical assistant. Subjects will have been reminded in advance to fast 12 hours prior to their research visit. The following blood tests will be done: CBC and CMP. A copy of their blood test results, including the two fasting lipid profile tests, will be given to the subject via e-mail or mail. This visit will be about 2 hours in length.