Kitáb-i-Aqdas

The traveller, the ailing, those who are with child or giving suck, are not bound by the Fast; they have been exempted by God as a token of His grace.   ¶16

Exemption from fasting is granted to those who are ill or of advanced age (see note 14), women in their courses (see note 20), travellers (see note 30) and to women who are pregnant and those who are nursing. This exemption is also extended to people who are engaged in heavy labour, who, at the same time, are advised "to show respect to the law of God and for the exalted station of the Fast" by eating "with frugality and in private" (Q and A 76). Shoghi Effendi has indicated that the types of work which would exempt people from the Fast will be defined by the Universal House of Justice.