The one meal a day diet is a weight loss plan that requires a person to eat only one meal per day. This is a type of intermittent fasting that involves alternating between extended periods of not eating or drinking anything with calories and periods of eating.
The one meal a day diet utilizes a type of intermittent fasting referred to as 23:1, meaning a person spends 23 hours of the day fasting, leaving just 1 hour a day to eat, drink and consume calories.
In the one meal a day diet, most people choose to not eat or drink anything with calories during the day. They break their fast when they eat dinner, then resume fasting until the following evening.