The Claim
A 2-day very-high-carbohydrate diet at 15.9 g·kg⁻¹·day⁻¹ in elite male racewalkers is associated with a 1.8 kg increase in body mass due to glycogen-bound water retention, indicating that extreme carbohydrate loading may result in clinically significant weight gain that affects performance in weight-sensitive endurance sports.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Elite male racewalkers who consumed a very high-carbohydrate diet for two days gained 1.8 kilograms in body weight, which occurred because stored glycogen retained water. This weight gain could impact performance in sports where body weight matters.
See the scientific wording
In an elite male racewalker, a 2-day very-high-carbohydrate diet (15.9 g·kg⁻¹·day⁻¹) was associated with a 1.8 kg increase in body mass, consistent with glycogen-bound water retention, suggesting that extreme carbohydrate loading may lead to clinically significant weight gain that could affect performance in weight-sensitive endurance sports.
When a person eats a very large amount of carbohydrates, their blood sugar rises, which signals the body to store more sugar as glycogen in muscles. Each gram of stored glycogen pulls in 3 to 5 grams of water, making the muscles heavier. This extra water adds to the total body weight. If the person also reduces training, muscles use less glycogen, so more gets stored. Muscles that work the hardest during exercise, like the back of the thighs in racewalking, store the most glycogen and water.
What the research says
1 studyWhen this elite racewalker ate a huge amount of carbs for two days, his body stored more energy in his muscles and pulled in extra water, making him 1.8 kg heavier — just like the claim says. He felt bloated, but the weight gain was real.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.