If one wants to stop eating non vegetarian food, first thing to do is to change your opinion that eating non vegetarian food is not good and decide strongly to be a vegetarian person. If one eats non vegetarian food, one's spiritual grasping decreases.

In English: http://www.dadabhagwan.org/path-to-happiness/spiritual-science/non-violence-and-spiritual-awareness/food-and-spiritual-awareness/

In Hindi: http://hindi.dadabhagwan.org/path-to-happiness/spiritual-science/non-violence-and-spiritual-awareness/food-and-spiritual-awareness/

In Gujarati: http://www.dadabhagwan.in/path-to-happiness/spiritual-science/non-violence-and-spiritual-awareness/food-and-spiritual-awareness/