I've read before that dairy products can be one of the causes of hair loss, there are some researches done on it I believe. Here is an article about it:
Update Dairy Consumption and Hairloss

Also, I know that many asian people use ginger to fight hairloss. Grate the ginger (to especially get the 'juice' out) and massage it on the scalp at places where the hair is thinning or falling. The ginger stimulates the blood circulations, encouraging hair growth.

I hope it helps. Good luck =)