Allergies, asthma, food sensitivities, eczema and autoimmune disease. What do all of these conditions have in common?... The answer is intestinal permeability, also known as 'leaky gut'. Our guts are the 'centre of our health' and host 70-80% of our immune system. This is why, when our guts are dysfunctional and unhappy, the whole body can be negatively affected and symptoms can appear widespread, potentially impacting every system of the body. So what causes a ‘leaky gut’ ?