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OMAD: one meal a day

Roughly 23 hours fasting and one meal. It reaches the far end of Ketosis Entry and stops just short of Fat Burning, which makes it the deepest schedule you can run every day.

The demanding part is not the fast. It is getting a day's worth of food, and particularly protein, into a single sitting.

Where an OMAD fast finishes

Around 23h, an hour short of Fat Burning

0-3hFed State

3-8hEarly Fasting

8-14hGlycogen Depletion

14-18hFat Mobilisation

18-24hKetosis Entry

24-48hFat Burning

Five stages complete and the fifth nearly finished. Push the meal an hour later and the fast crosses into Fat Burning, which is why some people run OMAD and a weekly 24 hour fast as the same habit.

The one meal

One meal has to do the work of three

This is the whole difficulty of OMAD, and it is a nutrition problem rather than a willpower one. Struggling with this schedule usually means undereating, not overeating.

Protein is the hard target

A day's protein in one sitting takes deliberate planning. Build the plate around it and add the rest afterwards.

Take an hour over it

Eating a large volume quickly after 23 hours is uncomfortable. Slower and longer works better than a single fast plate.

Keep the meal at the same hour

A fixed slot makes the day predictable and stops the fast drifting longer each time by accident.

Compare all nine schedules →

Burn's timer at 20 hours 9 minutes, the stage pill reading KETOSIS

Burn's Choose a Plan sheet, with OMAD among the advanced plans

Honest about the trade

OMAD suits some people and not others

It is the most restrictive daily schedule Burn offers. Worth being clear about who it works for.

WORKS WELL IF

You already hold a 20:4 without effort

You prefer one decision about food a day to five

Your day has one reliable slot for a long meal

You are willing to plan the meal rather than improvise it

CHOOSE SOMETHING SHORTER IF

You train hard, where recovery wants protein spread across the day

You are building or holding muscle

Meals are social and unpredictable in your week

A single restrictive meal risks a difficult relationship with food

A 16:8 you keep for a year beats an OMAD you keep for three weeks. The best schedule is the one that survives your actual life.

Burn's streak detail screen showing a 61 day streak, a milestone ladder at 7, 14, 30, 60 and 90 days, and a Streak Freezes card

Burn's Journal showing water tracked against a daily total and an Electrolytes card logging sodium, potassium and magnesium

Running it in Burn

At this length, hydration and history both matter

Water and electrolytes, logged

Twenty-three hours without food means no sodium coming in with meals. The Journal holds water, sodium, potassium and magnesium against your own targets.

Streak freezes for the days it does not fit

One meal a day does not survive every wedding and work trip. A freeze keeps the streak honest without pretending the fast happened.

Body Score across the week

Fasting is one input alongside hydration and activity, so a good fast on a bad week still reads as a bad week.

Electrolytes guide → How Body Score works →

What the stage boundaries mean

Burn names Ketosis Entry at 18 hours and Fat Burning at 24 because a timer has to draw lines. Onset varies with your last meal, your activity, your sleep and your metabolism, and Burn does not measure ketosis, autophagy, or metabolic state.

Who should get advice first

Speak to a doctor before starting if you are pregnant or breastfeeding, have a history of eating disorders, manage diabetes, take medication timed to meals, or are under 18. Stop and eat if you feel unwell, whatever the timer says.

One meal, one clock you can trust

Burn names every stage you reach, tracks water and electrolytes alongside the fast, and keeps the streak honest with freezes.

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