Fatty substances (lipids) are secreted by the cells during the course of their journey from the base layer of the skin to the top. These lipid molecules join up and form a tough connecting network, in effect acting as the mortar between the bricks of a wall.

The cell wall barriers are simply layers of fats that surround the watery contents. Therefore, the communication mechanisms must operate through these fatty cell walls. In fact, many of the substances that are involved in this communication process are various fats since it is easiest for fats to move within the fatty layers that comprise the cell walls. Despite its bad reputation, proper fats and cellular fats are of major importance in our body’s biochemistry and physiology.

Damage to the skin barrier can result from a combination of genetic predisposion and exposure to sensitizing chemicals and other substances. That is why avoiding irritants is as important as using products that help. In skin care, the most common irritants are usually perfumes and preservatives.

Fatty substances control the majority of our body’s physiology through receptors that activate many important genes. Likewise, our skin barrier is comprised of a supporting structure of collagen, a protein that contains fats that serve a critical function. These fats prevent the excess loss of water through our skin and prevent the cells of our body from becoming dehydrated and dying.

A major sign of a defective skin is the dryness that results from excessive water loss. This water can not be applied topically but must be ingested. To prevent the excessive water loss and the resulting dry skin, we must repair the skin barrier. We find that the skin composition in individuals with dry skin is due to an improper mixture of the skin fats. This is commonly due to a deficiency in our diet of the correct fats, those contained in natural olive oils, avocados, and healthy nuts, etc. On a nutritional basis, we can provide these necessary fats through the skin sometimes through topical treatments containing natural butters or oils, like Shea, olive and cocoa butter. The epidermis is not a usual means to acquire nutrition but it can absorb enough fatty substances to correct the fat imbalances that are the cause of the defect in the skin’s barrier function and thus correct the dry, itchy skin or sensitive skin problem. Try to be aware of chemical preservatives in any topical products you do use.