The Claim
In well-trained male cyclists, a 6-day high-fat diet (68% of energy from fat) followed by 1 day of carbohydrate loading (8–10 g/kg) results in a statistically significant reduction in high-intensity sprint power output during 1-km sprints (>90% of peak power) compared to a 6-day high-carbohydrate diet (68% of energy from carbohydrates) followed by the same carbohydrate loading, despite no difference in overall 100-km time-trial performance.
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.
If elite male cyclists eat a super high-fat diet for 6 days before carb-loading for a day, they’ll feel just as fast over a long 100-km ride — but they’ll have less power for short, intense sprints compared to when they eat a high-carb diet first.
See the scientific wording
In well-trained male cyclists, following a 6-day high-fat diet (68% fat energy) followed by 1 day of carbohydrate loading (8–10 g/kg), high-intensity sprint power output during 1-km sprints (>90% of peak power) is reduced by a statistically significant margin compared to a high-carbohydrate diet (68% carbohydrate energy) followed by the same carbohydrate loading, despite similar overall time-trial performance over 100 km.
What the research says
1 studyStudy: Fat adaptation followed by carbohydrate loading compromises high-intensity sprint performance.
The study found that cyclists who ate a high-fat diet for 6 days and then loaded up on carbs did worse on short, intense sprints compared to those who ate lots of carbs all along, even though their overall race times were the same.
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.