How to know that the particular body is healthy? No measurement for health has been set by medical science. I.A.S.S. has its unique concept to measure whether one is healthy. Put the body on fasting, see how many abnormalities, fatigue and tiredness, one is feeling, the more one is diseased. The abnormalities are because of the presence of impurities in a body which may be in various forms including toxemia and acidity. It is said, “Any abnormal symptom of an empty stomach is never due to the lack of food but always due to the presence of impurities.”