“Now let us speak of material healing. The science of medicine is still in a condition of infancy; it has not reached maturity. But when it has reached this point, cures will be performed by things which are not repulsive to the smell and taste of man — that is to say, by aliments, fruits and vegetables which are agreeable to the taste and have an agreeable smell. For the provoking cause of disease — that is to say, the cause of the entrance of disease into the human body — is either a physical one or is the effect of excitement of the nerves.” – ‘Abdu’l-Bahá, Some Answered Questions, p. 257

“… It is certain that in this wonderful new age the development of medical science will lead to the doctors’ healing their patients with foods. …At whatever time highly-skilled physicians shall have developed the healing of illnesses by means of foods, and shall make provision for simple foods, and shall prohibit humankind from living as slaves to their lustful appetites, it is certain that the incidence of chronic and diversified illnesses will abate, and the general health of all mankind will be much improved. This is destined to come about. In the same way, in the character, the conduct and the manners of men, universal modifications will be made.” – ‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 153

“It is, therefore, evident that it is possible to cure by foods, aliments and fruits; but as today the science of medicine is imperfect, this fact is not yet fully grasped. When the science of medicine reaches perfection, treatment will be given by foods, aliments, fragrant fruits and vegetables, and by various waters, hot and cold in temperature.” – ‘Abdu’l-Bahá, Some Answered Questions, p. 258