An intermittent fasting program prescribes a diet approach that alternates between periods of eating and fasting.
During an intermittent fasting program, the individual will fast for an interval of time, usually no more than 48hrs, and then eat normally for the remaining period of time per week. The most common example of this is known as the “5:2” diet, where calories are severely restricted for 2 days (preferably non-consecutive), and then normal eating occurs for the other 5 days in the week. Other intermittent fasting programs include complete fasts where no food is consumed for a specific length of time (commonly 16-24 hours), also non-consecutive days per week.
While weight loss and fat burning results can be substantial with intermittent fasting programs, benefits that promote changes at the cellular level require a type of fasting program that extends beyond 48 hours.