Wellness
Transepidermal Water Loss Explained
Understand transepidermal water loss (TEWL), the process of moisture evaporating from the skin, and why managing it is key for healthy skin.
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What is it?
Transepidermal Water Loss (TEWL) is the natural, continuous process of water evaporating from the deeper layers of the skin, through the epidermis, and into the atmosphere. This process is also known as insensible water loss because it happens without our awareness. While a certain amount of TEWL is normal and unavoidable, excessive water loss can indicate that the skin's protective barrier is compromised. A healthy skin barrier, often compared to a brick wall of cells and lipids, effectively regulates moisture levels, but when damaged, it allows too much water to escape.
Why is it trending?
The term "transepidermal water loss" is gaining popularity in wellness and beauty circles due to the growing focus on maintaining a healthy "skin barrier." Skincare enthusiasts and brands are increasingly emphasizing the importance of protecting and repairing this barrier. TEWL is a key measurement of skin barrier function; a high rate of TEWL suggests a damaged barrier. This shift towards a more scientific, health-oriented approach to skincare means consumers are more aware of concepts like TEWL and are seeking products with ingredients like ceramides and hyaluronic acid to minimize water loss and support overall skin health.
How does it affect people?
Excessive TEWL directly impacts the skin's health and appearance. When the rate of water loss surpasses the skin's ability to rehydrate, it leads to dehydration. This can manifest as skin that feels tight, dry, and uncomfortable. Visibly, it can cause flakiness, roughness, and make fine lines and wrinkles appear more prominent. A compromised barrier due to high TEWL also leaves the skin more vulnerable to external irritants and environmental stressors. In some cases, it can worsen inflammatory skin conditions like eczema or atopic dermatitis.