OMAD jejum (h)

OMAD = 23h jejum.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

jejum
23 h

About this calculator

The OMAD fasting calculator helps determine the duration of the 23-hour fast. OMAD, short for One Meal A Day, is an intermittent fasting practice where one eats only one meal a day. For 23 hours, the body does not ingest food, which can aid in weight loss and improvement of metabolic health.

This practice works based on the idea that by restricting the eating period, the body starts to use stored fat as an energy source instead of constantly relying on glucose from food. The formula used is simple: 24 hours in a day, minus 1 hour for the meal, equals 23 hours of fasting.

When to use OMAD? It is recommended for people looking to lose weight, improve insulin sensitivity, or increase energy. However, it is crucial to consider nutritional choices during the meal to ensure the intake of all necessary nutrients.

It's essential to be mindful of hydration during fasting and to listen to your body, stopping the practice if adverse side effects occur. Additionally, individuals with certain health conditions should consult a professional before starting any fasting plan.

Frequently asked questions

How long does OMAD fasting last?

OMAD fasting lasts 23 hours.

Can I drink water during OMAD fasting?

Yes, staying hydrated is important.

What are the benefits of OMAD fasting?

Weight loss, improved metabolic health, and increased energy.

Who should not do OMAD fasting?

Individuals with certain health conditions should consult a professional before starting.

How do I start OMAD fasting?

Set a meal time and stay hydrated during the fast.

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