It has been said that one should concentrate on the throat for an hour and fifteen minutes. This is because it would help the formation of thyroxin or the secretion from the thyroid gland, and the process of metabolism would be proper. Thyroid is related not only with our process of metabolism but also with our instincts. If the functioning of the thyroid is not correct one can start having mental disturbances like fear, depression, etc.
Let the paryapti with regard to food function fully without any hindrance. Evil thoughts also cause an obstruction in this. Thinking also becomes an obstruction and even unrestraint regarding food is also an obstruction. If we think about Mahavira's science of health, we shall have to consider first of all whether our paryapti with regard to food is functioning well and ensure that no obstructions are created.