As to your question regarding the Fast: if there is any
doubt in the mind of a person as to whether it will really be bad for that
person's health to keep it, the best doctor's advice should be obtained.
(From
a letter dated 14 April 1947 written on behalf of Shoghi Effendi, quoted by the
Research Department of the Universal House of Justice in a Memorandum dated 2
January 1998.)