OMAD = One Meal A Day. It can also be referred to as a 23:1 diet plan. You eat only one meal a day.
You can choose to eat whatever meal you choose with no restrictions inside of your eating window but cannot be consuming any caloric beverages or food outside of your one-hour eating time frame.
The OMAD diet is also not appropriate for many groups of people, including those who are pregnant or breastfeeding, children and teens, older adults, and people with eating disorders.