The updated chapter on diet now contains all the elements of the GAPS diet: the GAPS Introduction Diet, the Full GAPS Diet and a section on how to come off the diet. As far as the GAPS Diet itself is concerned, it is largely based on the older Specific Carbohydrate Diet (SCD), with some extra tweaks. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average.

Gut and Physiology Syndrome takes an in-depth look at the underlying causes of today's health crisis--environmental and dietary poisons--and then provides a comprehensive plan for detoxification and nourishment to achieve the good health and clear mind that is the birth right of every adult and every child. It takes you step by step through what to eat and avoid and covers all the health issues that can be improved or cured by this diet. She pays exceptional attention to the issues of toxicity, low stomach acidity and imbalanced gut flora, citing these as key reasons for improper digestion, damage to the intestinal membrane and resulting gut permeability and the associated allergies, intolerances and autoimmune responses. Dr Campbell-McBride is a keynote speaker at many professional conferences and seminars around the world. The GAPS diet recommends that its followers take probiotics, essential fatty acids, cod liver oil, and digestive enzymes.But so far, studies have been small and dropout rates high, so it’s still unclear how these diets may work and which people they may help ( 7).

The Heal Your Gut Cookbook is a must-have if you are following the GAPS Diet, considering starting the GAPS Diet, or simply looking to improve your digestive health and – by extension – your physical and mental well-being. A small number of studies have found that some children with autism have increased intestinal permeability ( 22, 23, 24, 25).

To remedy this, she suggests followers of the diet take a supplement of betaine HCl with added pepsin before each meal.