Research conducted by University of California, Berkeley suggests there are major health benefits to fasting. Benefits include a reduced risk of cancer, the slowing of the aging process and the potential to increase maximum life span[17]. Currently, the reduction of caloric intake is the only proven method of increasing the lifespan of an organism[2]. According to Dr. Mark P. Mattson, chief of the laboratory of neurosciences at the National Institute on Aging, fasting every other day (intermittent fasting) shows as strong if not stronger beneficial effects as caloric-restriction diets[3]. According to The National Academy of Sciences other health benefits include stress resistance, increased insulin sensitivity, reduced morbidity, and again increased life span [4][5]. Long term studies in humans have not been conducted. However, short term human trials showed benefits in weight loss. The side effect was the participants felt cranky during the three week trial. According to the study conducted by Dr. Dr. Eric Ravussin "Alternate-day fasting may be an alternative to prolonged diet restriction for increasing the life span[18]."
Adherence to Greek Orthodox fasting periods contributes to a reduction in the blood lipid profile including a non-significant reduction in HDL cholesterol and possible impact on obesity [19].