To quote Natasha Campbell McBride

“I believe that our digestive system holds the roots of our health; GAPS conditions stem from the unhealthy gut. The list of GAPS conditions is long; I divided them into two groups:

1. Gut And Psychology Syndrome
2. Gut And Physiology Syndrome

Gut And Psychology Syndrome or GAPS includes learning disabilities and mental disorders, such as autism, ADHD/ADD, dyslexia, dyspraxia, addictions, depression, obsessive-compulsive disorder, bipolar disorder, schizophrenia, epilepsy, eating disorders and many other conditions, which affect the function of the brain. Many of these conditions have no established diagnostic labels and present themselves as a mixture of various so-called mental symptoms: mood alterations, memory and cognitive problems, behavioural and social problems, panic attacks, anxiety, involuntary movements, various tics and fits, sensory problems, etc.

Gut And Physiology Syndrome or GAPS includes various chronic physical conditions, which stem from the unhealthy gut, such as autoimmune conditions (celiac disease, rheumatoid arthritis, diabetes type one, multiple sclerosis, amyotrophic lateral sclerosis, systemic lupus erythematosus, osteoarthritis, Crohn’s disease, ulcerative colitis, autoimmune skin problems, etc.), atopic conditions (asthma, eczema, various allergies), food allergy/intolerance, chronic fatigue syndrome, fibromyalgia, ME, multiple chemical sensitivity, arthritis, PMS and other menstrual problems, many endocrine disorders (thyroid, adrenal and other) and all digestive disorders (such as irritable bowel syndrome, gastritis and various colitis). Many conditions do not fit into any diagnostic box and can present as a mixture of symptoms: digestive problems, fatigue, muscular weakness, cramps and abnormal muscle tone, pain and ache in joints and muscles, skin problems, hormonal abnormalities.

In almost all cases the symptoms from both GAP Syndromes overlap: people with mental problems suffer physical symptoms (painful joints and muscles, fatigue, skin problems, asthma, hormonal problems, autoimmunity), while people with physical conditions have mental symptoms (such as depression, ‘brain fog’, inability to concentrate, mood swings, sleep abnormalities, memory problems, anxiety, tremors, tics, fits, etc.). When the digestive system is unwell, so instead of being a source of nourishment, it becomes a major source of toxicity in the body, nothing in the body can function well. Any organ, any system, any cell can show symptoms of distress – usually many of them respond with some symptoms.”