The one-meal-a-day diet is a weight loss plan in which a person eats only one meal per day. On this plan, they will not eat or drink anything containing calories for most of the day. It is a type of intermittent fasting. It alternates long periods without eating or drinking anything containing calories with short time windows for eating. The diet utilizes a type of intermittent fasting called 23:1. This means that a person spends 23 hours of the day fasting, leaving just 1 hour per day to consume calories. Most people who follow this diet eat their meal at dinner time, then fast again until the following evening. However, some research suggests that eating breakfast may aid glucose control later in the day and reduce the risk of type 2 diabetes. Other research contradicts these conclusions, suggesting that skipping breakfast may actually be a beneficial strategy for some people in managing overall calorie consumption.