| Factor | Low Carb | High Carb |
|---|---|---|
| High-intensity performance | Impaired | Supported |
| Fat burning | Higher proportion | Lower proportion |
| Muscle glycogen | Lower | Higher |
| Recovery speed | Slower | Faster |
| Weight loss | Often initially faster | Depends on total calories |
| Best for | Low-intensity endurance | High-intensity/strength |
| Adherence | Harder for many | Easier for most |
Choose Low Carb when…
You primarily do low-to-moderate intensity training, are focusing on fat loss, have metabolic reasons to reduce carbs, do endurance events at low-to-moderate intensity, or simply feel and perform better with fewer carbs.
Choose High Carb when…
You do high-intensity training, sprinting, weightlifting or team sports, want to maximise performance, are building muscle, or need quick recovery between sessions.
Gear for both
Sports Energy Gels
Fast-absorbing carbohydrates for fuelling high-intensity training.
Check price on AmazonCarb-Free Protein Bars
High-protein, low-carb snacks for training on a reduced-carb plan.
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FAQ
Do athletes need carbs?
Athletes doing high-intensity training, team sports or strength work need carbohydrates as the primary fuel. Research consistently shows carbohydrate availability is critical for high-intensity performance, anaerobic capacity and recovery between sessions.
Can you lift weights on a low-carb diet?
Yes, but performance is generally lower. Strength and power output drop when glycogen is depleted, especially on heavy compound lifts and high-rep sets. Some adaptation occurs over weeks, but most research shows high-intensity strength work is better fuelled by carbohydrates.
What is glycogen and why does it matter for sport?
Glycogen is the stored form of carbohydrate in muscles and the liver, used as the primary fuel source during moderate to high-intensity exercise. Muscle glycogen provides approximately 300–500g of stored energy (about 1,200–2,000 calories). Once glycogen is depleted, performance drops significantly — this is the mechanism behind 'hitting the wall' in marathon running. Carbohydrate intake before and during exercise maintains glycogen availability and delays fatigue.