Hair loss is generally considered hereditary (i.e. androgenetic alopecia) which is true in most cases but there are other causes that compliment to hair loss these things if put to practice could not only help in reducing hair loss. This also holds true for people who have heredity hair loss as they can effectively slow down the process and have their hair for some extra years. Following steps can be taken in order to prevent hair loss:

Take proper diet so as to prevent lack of protein or iron which causes hair loss. Protein is important for hair growth and can be obtained from fish, eggs, beans, yogurt, soy etc. Eat healthy diet.

Try to avoid excessive stress and use of medicines (such as blood thinners) as they are known to retard hair growth.

Exercise, rest and get sufficient sleep to maximize your hair growth.

Avoid smoking, caffeine, and use of colas as they hold back the maximum hair growth.

Use of hot water while washing your hair and the use of hot blow-dryers can also hinder hair growth. Dry your hair by patting gently. Also try to protect your scalp from the sun.

Use a good herbal shampoo. Don't use chemical based shampoos.

Brush gently when your hairs are wet.

Cut back the use of hair-gels, creams and hair-dyeing chemicals. Herbal oil massage nourishes your hair naturally.

When getting your hair trimmed, ask your barber to use a good quality steel scissors instead of blunt scissors.