Sawm. (To abstain from eating, drinking, sex, and smoking from dawn (before the Fajr prayers) to sunset (a small meal of dates and water may be used to break the fast before Maghrib - say, 10 minutes before) -- during the month of Ramadan, which is from September 1 to 30 next year. There are penalties for intentionally breaking the fast. One can also fast on Mondays and Thursdays.)
Islamic dietary laws. (No alcohol, pork, or blood. Let's leave it at that.)
Healthy diet. (Basically just follow the Nutrition Guidelines on the back of the packaging of the processed food you eat.)

Also, the Copts are vegan for all of Holy Week.