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Introduction

The total amount of body hair is difficult to estimate. The head alone has approximately 100,000 hairs. There are three phases in the life cycle of the hair that need to be distinguished:

1. the growing stage, called anagen;

2. the involution stage, called catagen;

3. the resting stage, called telogen.

Many factors, including general health, climate, drugs, hormones, and genetic programming, affect the growth of the hair. The rate of hair growth varies in different body regions (Fig. 11.5). On average, human hair grows 0.37 mm daily. In males, the scalp hair grows slower and the body hair grows faster than in females. Androgen increases the hair growth on the trunk and plays a role in male-pattern balding, however the exact mechanism is not fully understood. Seventy to 100 scalp hairs are shed daily in the normal telogen phase. In the ageing process, the hair also loses color because melanin fails to be synthesized in the hair matrix.

Fig. 11.5 Daily hair growth in different body areas

Hair growth (mm)

Age (years)

Frontal

Whorl

Occipital

Temporal

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Hair Loss Prevention

Hair Loss Prevention

The best start to preventing hair loss is understanding the basics of hair what it is, how it grows, what system malfunctions can cause it to stop growing. And this ebook will cover the bases for you. Note that the contents here are not presented from a medical practitioner, and that any and all dietary and medical planning should be made under the guidance of your own medical and health practitioners. This content only presents overviews of hair loss prevention research for educational purposes and does not replace medical advice from a professional physician.

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