If you want to gain control over the food that you take in, you should not go on feeding the tongue whatever it desires. You have to develop Buddhi Yoga which means developing a discriminating mind. You have to apply your discriminating faculties to constantly seek out that which is permanent and distinguish it from that which is insentient, that can be described as Buddhi Yoga the Yoga of intelligence. You have to explore and find out whether the food you take in relates to Sattvika or Rajasika or Tamasika qualities. Is the food of a very high standard or purity? If you were to inquire in this way using your discrimination and take the food in judiciously, you would not be affected by censure or praise, you would always remain equal minded. (DBG, p. 40)