This section is from the book "The Hygienic System: Fasting And Sun Bathing", by Herbert M. Shelton. Also available from Amazon: The Hygienic System Vol III Fasting and Sun Bathing.
In many cases, particularly of overfed individuals, we have what is called "famine fever" when a fast is entered upon. It is a slight elevation of temperature which may last from one to several days. I agree with Carrington that "it is, as in the case of all other diseases, a curative crisis, and should be regarded as a favorable sign, in consequence." Dr. Rabagliatti also regarded it as curative and added: "If we cannot fast without fever, it is because we have been previously improperly fed."