Hello .
To prevent hair loss you may follow some points....
1-Eat a protein rich diet including green leafy vegetables, carrots, soybean, mango, dried apricots, whole grain cereals, sprouts, lentils, yeast, wheat germ, milk.
2- Coconut oil and castor are very good for hair.
3- Boil 1 cup mustard oil with 4 tablespoon henna (mehandi) leaves. Filter and bottle. Massage on the scalp regularly. It is very good for hair growth.
4- Do not wash your hair more than 2 times in a week. If you use any shampoo, use only a mild shampoo.
Thanks.