Why is your skin Dehydrated?
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      What is Dehydrated Skin? 

      Any skin type, whether it’s dry, oily, or combination, can have problems with dehydration. The effects may be more or less visible, but this water deficiency causes skin on your face and some or all of your body to feel uncomfortable, especially after bathing or showering. Although symptoms are very similar, dehydrated skin should not be confused with Dry Skin.

      What causes Dehydration


      Environmental factors Cold, winter, wind, pollution, UV rays, etc
      External factors such as tobacco or alcohol
      Emotional factors like stress or fatigue
      Certain medical treatments such as anti-acne or anti-cholesterol medications
      Essential oils
      Cosmetic productsthat are too aggressive, detergent, stripping or drying

      How is water regulated in the skin?

      The skin is very sensitive to water deficiencies, that’s why it has a hydroregulation mechanism.

      Skin hydroregulation

      The skin is 70% water. Nearly 75% is located deep down in the dermis where it plays an important role in the skin’s resistance.

      2 elements moisturise the epidermis:

      • static water, which is fixed,
      • and dynamic water, which circulates.

      Hydroregulation achieves a balance between these two aqueous components and it alone guarantees the skin’s physical and functional integrity. Three main factors contribute to hydroregulation: NMFs (Natural Moisturizing Factors), lipids in the horny layer and aquaporins.

      2) NMFs (Natural Moisturizing Factors)

      NMFs are molecules that can bind water within the horny layer; they are called humectants. The most commonly known NMFs are urea and lactic acid.

      Other substances used in cosmetics have the same properties; these include glycerine and xylitol.

      Water and the Skin’s Barrier Function

      The horny layer is made of cells without nuclei that are “cemented” by lipids called intercorneocyte lipids. The right quantity and quality of these lipids is necessary for the horny layer’s integrity and therefore its “barrier” function. When they are lacking or deteriorating, cellular cohesion is no longer guaranteed. The result is an increase in perspiration, also called Transepidermal Water Loss (TWL: permanent, light and natural evaporation of the water found in the body). Well-hydrated skin should be capable of retaining its water, hence the importance of the inter-corneocyte lipids.

      What are aquaporins?

      Aquaporins are the channels through which water moves in the epidermis. These proteins are made by the keratinocytes (epidermal generating cells) and inserted in their membrane to allow water molecules to pass through. This movement is essential to the skin. The epidermis is not vascularised. All elements required for cellular life (mineral salts, vitamins, nutritional elements, etc.) that are carried by the blood to the dermis reach the surface layers of the skin thanks to aquaporins. Without aquaporins, the epidermis would not be able to “feed” itself.

      How can you tell the difference between dry skin and dehydrated skin?

      Dehydrated skin is always a temporary condition that can be reversed with appropriate products. It is an alteration in the superficial layer of the epidermis that lacks water. This lack of hydration disturbs the skin’s barrier function and leads to discomfort.

      On the other hand, dry or very dry skin is a permanent condition that describes a particular skin type that is lacking both water and lipids.

      Who is affected?

      All skin types can become dehydrated in certain circumstances or during particular seasons.