The decision flow chart from Reale et al. (2017a) provides a structured, step-by-step framework for determining whether an athlete should cut weight and, if so, which methods to use and when to apply them. Two versions exist: one for competitions with a same-day weigh-in, and one for competitions with a long lag time (24+ hours between weigh-in and competition). This lesson walks through every decision node.

Starting Point

Check morning weight in a hydrated, fasted, and rested state with voided bladder and bowel. This is the only reliable baseline.

Decision 1: Is the athlete over the weight division?

• No: Maintain current body mass. Focus on pre-training fuelling and post-training recovery nutrition. No cut is needed.
• Yes: Proceed to the next decision.

Decision 2: Is the weigh-in more than 7 days away?

• Yes: Does the athlete have excessive fat mass (body fat above 5% for males or above 12% for females)? Yes: Consult a sports dietitian. Implement gradual fat loss strategies. Aim for approximately 1% body mass loss per week. No: Acute weight loss will be required during the week before the weigh-in. Proceed to the acute methods pathway.
• No (7 days or less): Maintain current body mass. Acute methods are the only option at this stage.

Decision 3: Is the cut too large to be safe?

Two thresholds signal that an athlete should not compete at their target weight class:

• Body mass more than 10% above the weight division
• Body mass more than 5% above the division with less than 4 hours of recovery time between weigh-in and competition

If either condition applies: do not compete at this weight class. Devise a body mass management plan for the next competition. If body fat is low, consider moving up a division. If body fat is higher, consult a sports dietitian for a longer-term plan.

Decision 4: Is glycogen depletion warranted?

• Body mass more than 5% above the division, or more than 3% above with less than 4 hours of recovery: use a low carbohydrate diet (less than 50 g/day). Begin 3 to 7 days before the weigh-in.
• Otherwise: dietary carbohydrate intake can remain as is.

The Acute Timeline

Once the flow chart determines that an acute cut is appropriate, it maps specific methods to a countdown timeline:

5 days before weigh-in

• Reduce dietary sodium to less than 500 mg/day
• If using water loading: begin at 100 ml/kg/day. Use 300 mg sodium per 240 kcal during the loading phase.

48 to 96 hours before weigh-in

• Reduce fibre to less than 10 g/day (low-residue diet)
• Focus on very low weight foods in the 24 hours before weigh-in

24 to 36 hours before weigh-in

• Restrict fluid intake
• Use scheduled training sessions to promote sweat losses

0 to 24 hours before weigh-in

• Begin passive dehydration if required
• Once target weight is achieved, begin cooling strategies immediately

Two Versions of the Flow Chart

Weigh-in on competition day

When the weigh-in happens on the same day as competition, recovery time is limited. The approach must be more conservative. Methods that require longer recovery (such as heavy sweating or glycogen depletion) are higher risk because there is less time to rehydrate, refuel, and return to a performance-ready state.

Long lag time (24+ hours between weigh-in and competition)

With a full day or more between weigh-in and competition, a wider range of methods becomes available. The athlete has time for thorough rehydration and glycogen restoration. Methods like water loading, glycogen depletion, and moderate sweat-based losses become more viable because the recovery window supports them.

Risk Spectrum

The flow chart classifies methods along a risk spectrum from low to high:

Low risk

• Low food weight
• Low residue diet
• Early timing for the final meal
• Gradual body fat reduction

Moderate risk

• Less than 3% body weight loss via fluid restriction
• Mild carbohydrate restriction

High risk

• More than 3% body weight loss via fluid restriction
• Active induced sweating
• Passive induced sweating
• Glycogen depletion

The flow chart PDF is attached to this lesson for download. Print it and keep it as a reference tool when planning any weight cut with an athlete.