Why Behaviour Matters in Performance Nutrition
Most athletes have a basic understanding of nutrition, but knowing the theory and applying it in day-to-day training are two very different things. Busy schedules, travel, and changing routines make it hard to turn good intentions into consistent habits.
The COM-B model, explored in sport by Meghan Bentley, explains why this happens. It shows that behaviour relies on three things: Capability, Opportunity, and Motivation. If one of these is missing, the habit often breaks down.
In this blog, we’ll explore how COM-B applies to performance nutrition and how you can use it to fuel more consistently for training and competition.
The COM-B Model Explained
What is COM-B?
COM-B is a framework from behavioural science that explains why people do or don’t follow certain habits. It stands for Capability, Opportunity, and Motivation – Behaviour. In simple terms, these three factors decide whether a behaviour, like eating well for training, actually happens.
The three pillars: Capability, Opportunity, Motivation
- Capability is about whether you can do the behaviour. Do you have the knowledge and skills to plan, shop, and prepare meals that support your training?
- Opportunity looks at whether your environment makes it easier or harder. Do you have access to the right foods when travelling, or the time in your schedule to prepare them?
- Motivation covers both your conscious goals (wanting to perform at your best) and your automatic habits (what you reach for when tired or stressed).
Why it’s useful for nutrition behaviour change
For athletes, nutrition advice is everywhere, but advice alone doesn’t change behaviour. By using COM-B, you can see which piece of the puzzle is missing and take practical steps to fix it. This means moving from just “knowing” what to eat, to consistently doing it, even under pressure.
Capability: Knowledge, Skills, and Physical Capacity
Nutrition literacy in athletes
Capability starts with knowing what your body needs. Many athletes understand the basics, carbs for energy, protein for recovery, but struggle to apply that knowledge to their own training load, competition schedule, or recovery needs. Building your nutrition literacy means learning how much, when, and what type of food fuels you best.
Cooking skills and meal preparation confidence
Even with good knowledge, fuelling can fall apart if you lack the skills to put it into practice. Confidence in the kitchen matters. Can you throw together a quick recovery meal, batch-cook for the week, or adapt recipes when travelling? These skills make it easier to stick to your plan when life gets busy. If they still remain a barrier then using fresh food delivery services like Hello Fresh or even pre-cooked delivery food services can help overcome the barriers, but these come ad added expense.
Physical capacity to implement fuelling strategies
Finally, capability is about whether your body can manage the strategy. For example, being able to eat before early training, tolerate gels mid-race, or hydrate properly during long sessions. If digestion or timing feels like a barrier, this is part of capability too, and it can be trained, just like fitness.
Opportunity: Environment, Resources, and Social Support
Access to high-quality food
Even the best nutrition plan won’t work if you can’t access the right foods. Travel, training camps, late-night sessions, or living away from home can all limit your choices. Opportunity means having the right options available, from supermarkets to training ground meals, so fuelling well is possible.
Time and routines
Busy schedules can make it hard to prioritise nutrition. If you’re rushing between work, study, and training, picking the kids up from school, grabbing whatever is easiest often wins. Opportunity is about shaping your routine so meals and snacks fit smoothly into your day, rather than being an afterthought.
Social support from teammates, coaches and family
The people around you matter too. If teammates dismiss nutrition or coaches don’t plan time for meals, it creates barriers. On the flip side, supportive environments, where athletes fuel together, or where coaches value recovery, or your partner helps with cooking for the family, make it easier to stay consistent
Motivation: Reflective and Automatic Drivers of Nutrition Choices
Reflective motivation
This is the conscious side of motivation — your goals, values, and decisions. For example, choosing to eat a balanced meal because you know it will support tomorrow’s training, or sticking to a hydration plan because you want to avoid fatigue. Reflective motivation links directly to your performance ambitions.
Automatic motivation
Not all food choices are planned. Habits, emotions, and cravings play a big role. You might grab a snack out of stress, or fall into the habit of skipping breakfast on busy mornings. These automatic patterns can either support your fuelling or undermine it, depending on how they’re shaped.
Making motivation work for you
For athletes, the key is aligning both types of motivation. Building small, consistent habits helps automatic choices work in your favour, while reminding yourself of bigger goals keeps reflective motivation strong. Over time, this balance makes eating well feel easier and more natural, rather than a constant battle.
Applying COM-B to Performance Nutrition Practice
The power of the COM-B model is that it helps you work out why a nutrition habit isn’t sticking and what to do about it. Instead of blaming yourself for “lack of willpower,” you can break the problem down and find practical fixes.
Step 1: Identify the behaviour you want to improve
Pick one nutrition habit you’d like to change – for example, eating a recovery meal within 60 minutes of training.
Step 2: Ask if you have the Capability
Do you know what a good recovery meal looks like? Do you have the skills to prepare one quickly? Can your body tolerate food straight after exercise?
Step 3: Look at the Opportunity
Do you have the ingredients ready at home or access to food at your training venue? Does your schedule allow time to eat before rushing to the next commitment?
Step 4: Check your Motivation
Do you see the value in recovery meals? Have you linked the habit to your performance goals? Or do tiredness and other habits often pull you in a different direction?
By running through these questions, you can spot whether it’s knowledge, environment, or mindset holding you back. Once you know the barrier, you can target the right solution, whether that’s learning new skills, planning your food environment better, or building stronger routines.
Case Examples in Sport
Example 1: Pre-training fuelling
An endurance athlete knows they should eat before long sessions but often skips breakfast. Using COM-B, the barrier isn’t knowledge, it’s capability. They struggle with stomach upset when eating early. By training the gut and starting with small, easy-to-digest carbs, they build tolerance. Over time, fuelling becomes possible and consistent.
Example 2: Recovery nutrition
A team sport player wants to recover faster but rarely eats after training. The issue here is opportunity. Training finishes late, shops are closed, and they go straight home. The fix is planning ahead: keeping recovery snacks in their kit bag or preparing a shake before leaving. Access creates the chance to succeed.
Example 3: Hydration during competition
A sprinter believes hydration matters but forgets to drink. The problem is motivation, specifically automatic habits. When focused on racing, drinking doesn’t cross their mind. Building a pre-planned routine (e.g., sipping every break or aligning fluid intake with warm-up drills) helps make hydration automatic.
These examples show how COM-B uncovers the real reason behind nutrition challenges. Once you know whether it’s capability, opportunity, or motivation holding you back, the solutions become much clearer.
Practical Takeaways: Making COM-B Work for You
The COM-B model is most powerful when you use it to guide simple, practical changes. Here are some quick wins for each part:
Capability
- Learn one or two new recovery meal ideas you can prepare fast.
- Practise eating small snacks before training to train your gut.
- Build confidence by cooking a few easy recipes you enjoy.
Opportunity
- Keep snacks in your training bag so you’re never caught short.
- Prep meals in advance if your schedule is busy.
- Talk with coaches or teammates about fuelling breaks during long sessions.
Motivation
- Link habits to your goals: remind yourself how fuelling supports recovery and performance.
- Build routines so actions become automatic, like drinking during warm-ups.
- Track small wins, feeling stronger in sessions can reinforce your choices.
Using COM-B isn’t about overhauling your diet overnight. It’s about spotting which piece is missing and making small changes that remove barriers. Over time, these changes add up to consistent fuelling and better performance.
Conclusion: From Knowledge to Action
Fuelling well isn’t just about knowing the science. It’s about whether you have the capability, the opportunity, and the motivation to put that knowledge into practice. The COM-B model makes it easier to see which of these pieces might be missing and how to fix it.
For athletes, this means less guesswork, fewer missed meals, and more consistent habits that actually support performance. Start by asking yourself: do I need to build skills, shape my environment, or strengthen my motivation?
Small changes in these areas can create big differences in training, recovery, and competition results.
If you’d like personalised support in applying COM-B to your nutrition, you can book a discovery call or visit my services page, together we’ll turn your nutrition knowledge into lasting performance habits.
