21 Day (Three-Week) water fast is classified under long term fasts and should be attempted only by those who are familiar with shorter one week or a 10-day water fasts. To do a long term fast, one has to understand the science of fasting from the medical viewpoint.
Water fast is one of the most potent methods used in Nature cure. Water fasting adheres to the basic principles of nature cure which is based on the use of five natural elements – earth, water, fire or sunlight, air and space for self-healing and rejuvenation. In water fasting, food is not consumed and body survives only on pure water, fresh air and sunlight.
One day (24-hour) water fasts have become a popular way to maintain health and vigor. Fasting uses the self-healing properties of the human body. Health improvements happen when the digestive system is given rest and the organs get ample time to repair and heal themselves.
One week water fast can be taken up by those who are well versed with the benefits of the shorter one day and three day water fasts. A one week water fast is more intense than a 3 day fast, but is definitely easy for those who have prior experience with shorter fasts.
A three day water fast can be taken up by those who are well versed with the one-day fast. A three day fast is little more intense than a 24-Hour fast. It is good to have prior experience with the shorter one-day water fasts. This experience will give one the confidence to take up the longer three-day water fast, which gives much more physical, mental and spiritual benefits.
Water fasting has been adopted from ages as an effective detox method. Water fasting relies on the self healing nature of the human body. Our digestive system works day and night without rest. It not only has to process the food that we eat, but also has to remove the waste matter and toxins. Imagine your car that runs 100 miles every day without oil change or maintenance for a couple of years.