White hair (or canities) is often the subject of much thought. Between popular beliefs and scientific facts, it is sometimes difficult to separate fact from fiction. In this article, we will explore and demystify 5 common theories about their appearance.
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Common theories about white hair
1) Stress causes white hair
The first theory is that anxiety causes white hair. Scientifically, the canities process is associated with a decrease in melanin production, the pigment responsible for hair color. Chronic stress can trigger the release of certain hormones, such as cortisol, which can disrupt the function of melanocytes, the melanin-producing cells. This disruption can lead to a decrease in melanin production and thus their appearance.
Studies suggest that oxidative stress induced by cortisol can damage melanocytes, affecting their ability to effectively produce melanin.
2) Pull out 1 = 2 grow back
This common misconception is false. Each hair follicle goes through a growth cycle comprising growth (anagen), transition (catagen), and resting (telogen) phases. Pulling out a white hair does not alter the cycle of other hair follicles. Furthermore, hair regrowth is regulated by specific molecular signals in the body, and pulling out one hair does not stimulate the regrowth of two others.
3) White hair is more fragile
Melanin, in addition to giving hair color, acts as a protective agent against UV damage and oxidative stress. White hair, due to its low melanin content, is more vulnerable to this damage. The hair's cortex, which is the central layer, is less protected and therefore more prone to fragility and breakage.
4) Pregnancy causes their appearance
Of course, pregnancy itself is not directly responsible for the appearance of white hair. However, the hormonal changes and anxiety associated with pregnancy and childbirth can influence the canities process. Hormones like cortisol can be released in greater quantities during this period, which can disrupt melanin production and promote their appearance.
5) Lack of vitamins increases their appearance
Vitamins and minerals play a crucial role in many biological processes, including melanin production. For example, vitamin B12, iron, and copper are involved in melanin production. Deficiencies in these nutrients can disrupt this process and contribute to the early emergence of white hair.
Causes of white hair during pregnancy
Why do I have white hair during pregnancy? This question concerns many pregnant women. Pregnancy is a period of intense hormonal upheaval that affects the entire body, including the hair. Several factors can explain their emergence or increase during this period:
- Hormonal fluctuations can disrupt the hormonal cycle of melanin production
- Physical and emotional stress related to pregnancy increases cortisol production
- Nutritional needs during pregnancy can lead to temporary deficiencies in essential vitamins and minerals for hair pigmentation
How to care for them?
For a beauty enhancement of canities, there are now shampoos and rinsing treatments that combine two main actions:
- an anti-yellowing effect, thanks to pigments that neutralize the yellowing of keratin and recharge the hair fiber with iridescent reflections. These shampoos give you a uniform, silky, and shiny white. They prevent your hair from drying out and becoming porous.
- an enhancing and nourishing effect, thanks to active ingredients, amino acids, or silicone derivatives. The hair fiber gains softness and suppleness, it strengthens. The hair revives, becoming shiny and supple. It regains all its characteristic elegance.
It is important to demystify the theories about the appearance of canities. This will allow for a better understanding of the factors that influence their appearance and health. By taking care of our emotional well-being and diet, we can contribute to maintaining the vitality of our hair.
