Why is being a vegetarian stressed so much while practicing yoga?
There is no hard and fast rule that a practitioner should become a complete vegetarian while practicing yoga. A normal diet which is balanced is what matters the most. However, as a yogi progresses in his path of yoga, he soon realizes that killing is unethical and therefore changes his diet automatically. On medical ground, a vegetarian diet is recommended due to many reasons. Most important among them is that, Asanas and Pranayama give an automatic repulsive force to body and mind that refuses flesh-based diet in order to bring cellular quietness. Therefore, simple vegetarian dishes do not irritate the system.