can is a) fasting. fasting is in a religion when people go without food for a period of time which can go from hours to days...

Avoiding food for a long period of time is A. FASTING Fasting is primarily a movement of willing abstinence or reduction from certain or all food, drink, or both, for a period of time. An absolute fast is an abstinence from all food and liquid for a specific period of time; usually a period of 24 hours, or a certain number of days.