We have an answer to all of your questions.
Here are the answers:
1) Avoid fast food
2) eat healthy food
3) Eat fruits and vegetables more and more
4) Drink plenty of water daily
You may use these ideas to stop hair fall and hair damage. First of all you should ignore shampoos and conditioners.
There are few steps you may follow : 1) Eat fruits/vegetable regularaly 2) Do exercise 3) Avoid junk food 4) Avoid fast food