There are enormous numbers of factors affecting hair growth, either they trigger the process of hair growth or they hamper hair development partially or totally.
We can categorize the hair growth factors into two:
Strong immune system
Balanced Diet:
Balanced diet greatly increases hair growth as hair produces when protoplasm of a cell exceeds than normal and cell divides. Once the cell divides, it also forms keratin, a protein that builds most of the hair.
Depression free life:
Hair growth is directly associated to hormones. Depression causes the fluctuation of hormones and as a result it leads to hair loss.
Strong Immune System:
Immune system responds to harmful substances invading into the body or in the body itself. If immune system is week, the responds badly to foreign stimuli and as a result hair follicles are stimulated to produce excessive sebum and they become inflamed and clogged.
Factors that hamper the process of hair development:
Heredity:
If your one of the parents had been suffered from loss of hair in their teenage, you are most likely to have same kind of hair loss in your teenage. Heredity is transferred through genes that code the instructions for new individual. Such hair loss genes if transferred to your body, you are most probably having it.
Smoking:
Smoking removes oxygen from cells and increase carbon monoxide an extremely toxic gas for body. It directly affects on your skin and hair follicles become inflamed. Even if smoking is not directly associated to hair loss, but it may lead to hair loss if different other factors coincide with.
Alcohol:
Alcohol is extremely harmful substance if you have follicular disorder indicated either by hair loss or eruptions of pimples and pustules.
Conclusion:
Hair loss is follicular disorder that is associated with different factors such as diet, smoking, alcohol and immune system