Orthodox Christianity is oldest branch. Note era of social and moral and health reform in US, cf. Rev. Sylvester Graham. Note role of Adventists in establishing health sanitorium in Battle Creek, Michigan, which became source of John Kellog's breakfast cereal empire. Primarily found in Iran, Iraq, Yemen, and India.
Eating is considered a matter of worship.
Food is to be shared. Food is not be thrown away or wasted. However, all foods not specifically prohibited may be eaten. Specific ritual for slaughter of animals. Alcoholic beverages are forbidden by the Qur'an, as are other intoxicants.