Permeability refers to how easily something can pass through another substance. It describes the ability of gases, liquids, or solids to flow or penetrate through a material. Full definition
Other excluded food items include processed and preserved foods and those that are difficult to digest and increase intestinal permeability of toxic substances. (proactive-healthcare.com)
«Leaky gut» syndrome is when the intestinal permeability of the gut wall is increased due to an autoimmune response. (integrativewomenshealthinstitute.com)
Indomethacin led to a more pronounced increase in intestinal permeability in gluten - sensitized mice. (ei-resource.org)