Cycling protein requirements are consistently underestimated by endurance athletes. The cycling community has historically been carb-obsessed — and rightly so, carbs fuel the work. But protein is what rebuilds you afterward. Without adequate protein intake, you can't recover from hard sessions, you can't build the muscular adaptations that make you faster, and you risk losing lean muscle mass during high-volume training blocks.
Hannah Grant, who we've had on the podcast discussing pro team nutrition, has consistently emphasised that protein is the most neglected macronutrient in the endurance world.
How Much Do You Need?
The Numbers
The current evidence-based recommendation for endurance athletes:
| Training Load | Protein Target | |---|---| | Light training (6-8 hrs/week) | 1.2-1.4g/kg/day | | Moderate training (8-12 hrs/week) | 1.4-1.6g/kg/day | | Heavy training (12+ hrs/week) | 1.6-1.8g/kg/day | | Weight loss phase | 1.8-2.2g/kg/day |
For a 75kg rider training 10 hours per week, that's roughly 105-120g of protein per day. Spread across four meals, that's 25-30g per meal.
Why Higher During Weight Loss
When you're in a calorie deficit — as many cyclists are during weight loss phases — protein becomes even more critical. Insufficient protein during a deficit means your body breaks down muscle for fuel. Higher protein intake protects lean mass while you lose fat.
Timing Matters
The Post-Ride Window
The "anabolic window" isn't as narrow as supplement companies claim, but timing still matters. Aim for 20-40g of protein within 2 hours of finishing a hard session. This maximises muscle protein synthesis — the process that repairs and strengthens muscle fibres.
Distribution Through the Day
Spreading protein intake across 4-5 meals/snacks is more effective than loading it all into one or two meals. Your body can only utilise ~40g of protein per sitting for muscle synthesis. Eating 80g at dinner and 20g the rest of the day is less effective than 4 x 30g.
Before Bed
30-40g of casein protein (or a protein-rich snack like Greek yoghurt) before bed supports overnight muscle repair. This is especially relevant during heavy training blocks. Sleep is when the majority of muscular recovery happens — give your body the raw materials.
Best Sources for Cyclists
Animal Sources (Complete Proteins)
- Chicken breast: 31g per 100g. Lean, versatile, affordable.
- Eggs: 13g per 2 eggs. Complete amino acid profile.
- Greek yoghurt: 10-15g per 150g. Excellent before bed (casein).
- Fish (salmon, tuna): 20-25g per 100g. Added omega-3 benefits.
- Whey protein: 20-25g per scoop. Fast-absorbing, convenient post-ride.
Plant Sources
- Lentils: 9g per 100g cooked. Also high in carbs — dual benefit.
- Tofu: 12g per 100g. Complete protein.
- Chickpeas: 7g per 100g cooked.
- Pea protein powder: 20-24g per scoop. Good alternative to whey.
Plant sources typically require combining different foods to get all essential amino acids, though soy and quinoa are complete on their own.
Common Mistakes
Protein-free breakfasts. Toast and jam or cereal with skimmed milk provides almost no protein. Add eggs, yoghurt, or a protein shake to your morning routine.
Neglecting post-ride. Finishing a hard session with just a carb-focused recovery drink misses the protein opportunity. Add 20-30g of protein.
All-or-nothing approach. You don't need chicken breast at every meal. Yoghurt, eggs, nuts, and protein-fortified foods all contribute.
Protein at the expense of carbs. This is the opposite mistake. Some riders go high-protein and drop carbs too low, which compromises training quality. You need both. Read about fuelling for the work required.
Key Takeaways
- Endurance cyclists need 1.4-1.8g protein per kg of body weight per day
- Increase to 1.8-2.2g/kg during weight loss phases to protect muscle mass
- Distribute intake across 4-5 meals — ~30g per sitting is optimal
- Get 20-40g within 2 hours of finishing hard sessions
- 30-40g before bed (casein or Greek yoghurt) supports overnight recovery
- Protein-rich breakfasts set the tone — don't start the day with zero protein
- Both animal and plant sources work — variety ensures complete amino acid coverage
- Protein supports, not replaces, adequate carbohydrate intake for training
- Use our Fuelling Calculator to set your carbohydrate targets for training and racing
