Comparing Two Types of Diets on Psychological and Gastrointestinal Symptoms

In the proposed study, the primary hypothesis is that, compared with a customary diet,
consumption of a paleo-diet will improve psychological and gastrointestinal symptoms in
patients with irritable bowel syndrome. Investigators also hypothesize consumption of the
Paleolithic diet will result in decreased intestinal permeability, decreased inflammatory
markers, and changes in the gut microbiome and microbiologic profiles.

Inclusion Criteria:

- Patients with mild to moderate Irritable Bowel Syndrome (IBS) and mild to moderate
anxiety or depression

- Other causes of bowel symptoms excluded to the satisfaction of the Study Team

- Age at least 18 years at initial screening visit

- Patients who are able to sign and understand the study's informed consent form

- Patients able to complete all screening evaluations and procedures

Exclusion Criteria:

- Patients in inpatient hospital care

- Severe or refractory bowel or psychological symptoms

- Current consumption of a Paleolithic diet

- Known Celiac disease

- Uncontrolled thyroid disease as indicated by an abnormal thyroid stimulating hormone
(TSH) level

- Uncontrolled diabetes as indicated by a HbA1c equal to 6.5 or greater

- Patients unable to speak English

- Inability to obtain informed consent

- Pregnant or nursing women

- Any condition, which in the opinion of the investigator, would interfere with study
requirements