“Fasting” requires that only one full meal be taken per day.  Two other smaller meals may be taken during the day to maintain physical strength, but these two meals together should not equal a full meal in quantity.  Fasting obliges all those who have reached the age of 18 and continues to oblige until age 59.  Those not specifically obliged to fast are encouraged to join in the discipline of fasting to the extent that they are able.