Fasting is considered healthy when combined with the right diet before and afterward, although there is not sufficient scientific evidence supporting it. Fasting has been observed to help eliminate certain conditions such as arthritis, lupus, psoriasis, eczema, ulcerative colitis and Crohn's disease.
Fasting can also help detoxify the body and stop cellular waste product buildup, thus possibly preventing atherosclerosis, diabetes, aging and other conditions. Fasting has also been used for its psychological benefits such as with stress and depression management.
Although fasting involves abstinence from food and drinks, it is not a weight loss tool. It may actually slow down a person's rate of metabolism. It is also not advisable for all people. People who should not fast include pregnant women, those with wasting diseases, cardiac arrhythmia or hepatic or renal insufficiency. Fasting for longer periods should be performed under medical supervision.