The Subject Information Form will be an administered questionnaire related to their health, disease, and their family medical history. They will then have 2½ tablespoons of blood drawn by a certified nurse or medical assistant. They will be reminded in advance to fast 12 hours prior to their research visit. The blood tests include: CBC, CMP, CRP, TSH, INR, fasting lipid profile and HbA1c. The subject will be given a 3-day food diary and a 14-day IBS symptom diary to complete before their next visit. They will also be provided with stool collection supplies and instructions to take home. When blood test results are available, those who do not fit the criteria will be called within 7 days after Visit 1 stating that they are ineligible. Among these blood tests, the fasting lipid profile results will be given to the subject after their participation in the study and after completion of the study. The rest of the results will be given to the subject at their next visit. If they continue to be a candidate in this study based on blood results, the potential subjects will fill out the 3-day food diary, continue to fill out the 14-day IBS symptom diary, and complete the stool collection the day before or the morning of Visit 2. The subject will be advised to not keep the stool at room temperature longer than 5 hours. If they anticipate it to be longer than 5 hours before their visit time, then the stool will be kept in the freezer. Both of the diaries and the stool sample are to be brought to Visit 2, which is 2 weeks after their Visit 1. Visit 1 will be about 3 hours in length.