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What Is OMAD and How Does Intermittent Fasting Work?

People sing the praises of eating one meal a day. But what is OMAD, and is time restricted eating and intermittent fasting a healthy way to lose weight?

By Megan Schmidt
Dec 21, 2023 5:00 PMMar 25, 2024 7:44 PM
Women Eating Weight Loss Diet
(Credit: Monkey Business Images/Shutterstock)

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Could you limit yourself to eating one meal a day over an extended period of time? It might sound crazy, but that’s the idea behind a diet that’s growing in popularity. It's known as OMAD, or “one meal a day,” diet. 

Proponents claim this extreme form of intermittent fasting offers benefits like weight loss and improved cognitive function. With this in mind, here’s a breakdown of how the OMAD diet works — and what science says about its weight loss potential.

What Is OMAD?

OMAD stands for "One Meal a Day." It's a diet that involves a 23:1 fasting-to-eating schedule. So, someone undertaking the diet eats one large meal during a one-hour feeding window. Then they fast for 23 hours without consuming any additional calories. OMAD makes other intermittent fasting approaches look pretty wimpy in comparison.

While the fast may be brutal, many people still find a lot to like about the one-meal-a-day diet. You can eat or drink pretty much whatever you want (even pizza, burgers and beer), and as much as you want, as long as you do so during your scheduled mealtime.

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