Many of the Yoga practitioners ask this question: "is it necessary to regulate the diet if we are already practicing Yoga Asana regularly?" For sure practicing Asana on a regular basis is important and healthy but complemented with regulation of diet can do magic. Having healthy eating habits is essential for Yogic lifestyle.
Food influences us on different levels of being from physical to emotional and spiritual. Yoga tradition never discuss food as proteins, Carbohydrate and Fats instead it talks about the qualities and influences of a particular food items. Since the beginning food is the prime concern of Yogis. According to the traditional scriptures without having the regulation over diet, it's almost impossible to move forward into the advanced stages of Yoga.