What is fasting alternative Therapies? The definition of fasting is primarily an act of willing abstinence or reduction from certain or all food, drink, or both, for a period of time. The fasting is important in nowadays most people dies from cancer in cigarette or disease in overweight. The objective of fasting is may reduce the risk of cancer, fasting helps you live longer, fasting makes your day simpler, fasting is much easier than dieting