Dr. David Dunn, nutritionist to World Tour teams, challenges everything you think you know about weight loss and cycling performance. He reveals why losing weight might actually make you slower, and explains the science of how elite cyclists fuel differently than amateurs—and why the gap between the two isn't as big as you'd think.
Key Takeaways
- Your fueling strategy should match the type, intensity, and duration of each specific session—not follow a one-size-fits-all daily calorie target. Training days demand different nutrition than rest days.
- Chronic underfueling over extended periods causes impaired performance, increased illness and injury risk, and poor recovery—not the lean fitness you're chasing. Most club cyclists carrying 3-7kg extra weight are actually overeating relative to their training demands, not undereating.
- Frame food as 'appropriate' or 'inappropriate' for your current situation, not 'good' or 'bad.' Coke during a stage race is appropriate; it's inappropriate if you're sedentary at a desk.
- Your gut is trainable like any other system. You can't jump from 60g carbs/hour to 120g overnight—gradually increase by 10g increments during key training sessions to build tolerance without GI distress.
- Knowledge alone doesn't drive behavior change. You need capability, opportunity, and motivation. Structure your environment to make the right choice the easiest choice—remove friction for good habits, add friction for bad ones.
- Elite cyclists aren't fundamentally different humans; they're just more efficient at converting power to movement and have access to better recovery infrastructure. The principles that work for them scale down for amateur riders.
Expert Quotes
"Nutrition is a training tool. It is fundamentally there to enhance your performance. What you eat before, during, and after exercise can amplify how your body responds or completely dampen if you get it wrong. — Dr. David Dunn"
"You're going to go out on the bike. You know it's about feeling good and when you have that session where you're able to produce what you want to produce and you feel you're capable of how can we replicate that. — Dr. David Dunn"
"Your body works off this law of preservation. If we don't have enough energy to sustain what we're doing, we'll start to shut off other processes. — Dr. David Dunn"