OMAD: one meal a day, done properly

OMAD is the simplest protocol on paper and the easiest to do badly. The whole game is making one meal carry a full day of nutrition.

The Kairo Guide · 5 min read

OMAD compresses all your eating into roughly one hour — about a 23-hour daily fast. The appeal is radical simplicity: no meal planning, no snacking decisions, one plate a day. The catch: that plate has to do everything.

Who OMAD suits (and doesn't)

• Suits: experienced fasters, people who love simplicity, natural non-breakfast-eaters, schedules with one big evening meal.
• Doesn't suit: beginners (start 16:8), hard-training athletes most days, anyone who struggles to eat large meals, and anyone with a history of disordered eating — the restriction pattern is a real risk.

Building a complete OMAD plate

• Protein first: a genuinely large serving — think 50–70 g in the meal.
• Volume vegetables: half the plate. Fibre and micronutrients are the first casualties of OMAD done lazily.
• Real carbs and fats: you have a whole day of energy to cover; this is not the place for a tiny salad.
• Eat slowly: give it 30–45 minutes. Fullness signals lag, and OMAD meals are big.

The mistakes that sink OMAD

• Under-eating chronically — one small meal a day is a crash diet with a fancy name. Energy, sleep, and training all degrade.
• No electrolytes — 23 hours fasted without salt is a headache generator.
• Junk OMAD — one giant ultra-processed meal misses every micronutrient two days running.

General information only, not medical advice. Consult a healthcare professional before starting any fasting routine, especially if you are pregnant, under 18, have a medical condition, or a history of disordered eating.