Initially, Demkina's demonstrations were well received. However, after she had left the United Kingdom, it emerged that she had made errors among her diagnoses. In one incident she told television-physician Chris Steele that he was suffering from a number of medical conditions, including kidney stones, an ailment of the gall bladder, and an enlarged liver and pancreas. Later medical evaluation determined that he was in good health and was not suffering from any of the ailments she had identified.
