Endurance
From threshold sessions to long runs: we plan carbohydrates, fluids and protein so you perform better and recover faster.
In short
What does endurance require from your diet?
Endurance sport largely runs on carbohydrates — especially at high intensity.
For long sessions, the body must be trained to take in nutrition along the way.
Recovery starts with what you do in the first two hours after the session.
Does this sound familiar?
This might sound like your situation
More energy on long sessions, steady heart rate, less stomach trouble during activity and better recovery the next day.
- You run out of fuel on long sessions and races
- Your stomach protests when you eat during activity
- You're unsure how much carbohydrate you need per hour
- Your form swings without training explaining it
- You want a simple strategy for food and drink
SmartEating recommends
What makes the biggest difference?
These factors decide whether your endurance training translates into real performance gains.
Carbohydrate timing
Match intake before, during and after sessions to training demand.
Fuelling during exercise
Practise taking in carbohydrate during sessions over 90 minutes.
Iron status
Low ferritin quietly limits oxygen delivery and endurance capacity.
Recovery nutrition
Carbs and protein within 1–2 hours restock glycogen and repair tissue.
Fluid and salt balance
Prevents performance drop and cramping, especially in heat.
When should you get help?
Fatigue, low iron levels and RED-S are common — and underestimated — problems.
- For unexplained plateaus
- For chronic fatigue
- For missed periods
- For low iron/ferritin levels
- For repeated injuries or illness
Assessment is done by a sports doctor or GP.
Common questions
What people ask us most often.
Is low-carb good for endurance?
For some sessions — rarely for competition. We periodise deliberately.
Personal nutrition
No one with endurance is exactly the same
Age, everyday life, activity level, other diagnoses and what you actually like to eat determine what works for you.
That's why people with the same starting point need different advice. SmartEating AI learns your situation over time and tailors suggestions to your body, goals and daily life.
- You run out of fuel on long sessions and races
- Your stomach protests when you eat during activity
- You're unsure how much carbohydrate you need per hour
- Your form swings without training explaining it
- You want a simple strategy for food and drink
We periodise your nutrition to your training week.
SmartEating gives you meals and fuelling strategies tailored to session volume.
A dietitian can build race strategies and prevent RED-S.
READ MORE
The knowledge behind the advice
Carbohydrates
Carbohydrates are the body's main energy source and are found in everything from fruit and vegetables to bread, pasta and sugar. The quality of the carbohydrate source matters far more for health than the amount alone.
Calories and energy
Calories measure the energy in food and drink, and energy balance is a fundamental principle of weight development. But counting calories alone says little about food quality, satiety or health effects.
Protein
Protein is the building block of muscles, skin, enzymes and hormones, and one of the nutrients that gives the most satiety. Most people get enough protein through a varied diet, but needs can shift with age, activity level and life stage.
Assessment
A digital form before the session so the specialist knows your situation.
Kick-off conversation
60 minutes online or at a partner clinic.
Personal plan
A concrete plan in SmartEating — food, structure and goals tailored to you.
Ready to get help with endurance?
We'll connect you with a licensed clinical dietitian who understands your situation.
Related topics
