The Prep Diet is undertake for 24 hours prior to your test. The goal is to starve the possible overgrowth of bacteria for a day in order to elicit a result when the substrate (lactulose or glucose) is consumed at the beginning of the test, after a baseline sample.

This diet, designed by Dr. Allison Siebecker, combines the low FODMAPs and SCD diets. This diet is the most restrictive but may relieve more symptoms in some people.

The low FODMAP diet was designed by researchers at Monash University to improve IBS symptoms. The diet focuses on removing carbohydrates that are high in fermentable oligosaccharides, disaccharides, monosaccharides and polyols.

The specific carbohydrate diet removes specific carbohydrates (polysaccharides, some oligosaccharides, disaccharides and polyols) and has been shown to be effective in healing IBD in one research study.

GAPs is a modification of SCD created by Dr. Natasha Campbell-McBride. It has a focus on the connection between the gut and the brain.