Refueling After the Weigh-In: How to Rehydrate Properly Before the Fight

The cut is only half the job. What decides how you stand in the ring is the refuel afterward. A perfect weigh-in followed by a sloppy rehydration gives you a weak, emptied fighter. Here’s how to do it right.

The window between weigh-in and fight

Your most important resource is time. The longer the gap between the weigh-in and the first bell, the more you can put back on:

• 24+ hours: Plenty to recover most of the lost water weight and fully top up your glycogen stores. The ideal scenario.
• 3–6 hours: Enough for fluids and light carbohydrates, but go gently — your stomach has to keep up.
• Same day/a few hours: Very limited. Here a hard cut rarely pays off. See our guide to how much weight you can lose.

Start immediately after you’ve weighed in — every fifteen minutes counts.

Fluids and electrolytes — not all at once

The classic mistake is pouring down 2–3 liters of plain water right after the weigh-in. It works against you: without salt you just dilute the body, the body flushes the fluid out again, and you end up running to the toilet instead of rehydrating.

Do this instead:

• About 1 liter per hour, spread out in sips — not in one large amount.
• Always with electrolytes, especially sodium. Salt helps the body hold on to fluid. See our guide to electrolytes and weight cutting.
• Use a sports drink or an electrolyte mix, not just tap water.
• Stop “topping up” when your urine is light and you feel normal — more fluid from there just causes bloating.

Carbohydrates and glycogen

During fight week’s water cut you’ve typically emptied a good part of your glycogen stores — the body’s fast fuel. The refuel is your chance to fill them back up, and it’s also where part of the water weight comes back naturally (every gram of glycogen binds about 3 grams of water).

• Go for easily digestible carbohydrates: rice, pasta, white bread, banana, mashed potato, sports drink.
• Spread it over several small meals rather than one large one.
• If you have plenty of time (24 h), you can easily get 8–10 g of carbohydrate per kg of body weight in over the whole window.

Food you should eat — and avoid

Eat:

• Rice, pasta, bread, potatoes
• Banana and other ripe fruit
• Lean protein in moderate amounts (chicken, fish)
• Salt on your food — it’s an advantage here

Avoid:

• Heavy, fatty meals (pizza, burgers, creamy sauces) — they sit like a brick and delay digestion
• Large amounts of fiber and raw vegetables — can upset your stomach
• Anything new and untested — fight day is not the time to experiment

The typical mistakes

1. Too much water too fast — you just drown your effort.
2. Only water, no salt — the body doesn’t hold on to it.
3. Food too fatty — slow digestion and a heavy stomach.
4. Experimenting — always run a dress rehearsal of your refuel before fight week.

Important

This guide is general information, not medical advice. If you’ve cut hard, rehydration is not a guarantee that the body is fully recovered — severe dehydration can be dangerous. If you’re young, new to the sport, or in doubt, do it together with your coach and a doctor. If you experience dizziness, confusion, cramps, or persistent discomfort, stop and seek help.

MyFightPrep helps you plan and track your refuel — fluids, electrolytes and carbohydrates hour by hour after the weigh-in — free.