There is a question I hear surprisingly often from runners, hikers, and endurance athletes. 

Can you trail run 11 miles without eating breakfast?

The answer is yes. But after a recent experience in the Colorado mountains, I realized that this is actually the wrong question.

The better question is this:

Can you give your body everything it needs to perform well, regardless of whether you eat breakfast?

That distinction changed the way I think about endurance nutrition, race preparation, and long mountain adventures. It reminded me that success on the trail is rarely determined by one decision. Instead, it's the result of dozens of small choices that either support your body or slowly work against it.

In this post (and the YouTube video linked here and the podcast episode linked here), I'll walk you through exactly what happened during my 11-mile mountain adventure, why I started struggling on the descent, and the fueling lesson that completely changed my perspective on endurance performance.

During one weekend adventure, I experienced both sides of that lesson. I felt incredibly strong climbing more than 4,300 vertical feet, only to struggle on the descent because I underestimated one critical part of my nutrition strategy.

Here's what happened and what I learned from it.

Why I Almost Skipped the Trail Run

The night before my run, I seriously considered canceling.

I've been training hard for HYROX, which combines running with demanding functional fitness stations like rowing, sled pushes, sled pulls, and burpee broad jumps. Along with running roughly 25 miles each week, I've been spending plenty of time in the gym improving my strength and power. The workload has been fantastic for my fitness, but it also left my glutes and lower back feeling incredibly tight after one particularly challenging workout.

I even texted my friend Brandon to tell him I probably wouldn't make our planned ascent of a Colorado 13er. My body simply didn't feel ready.

The next morning, though, everything changed.

I woke up early, took my dog for a short shakeout run, and realized my body actually felt much better than expected. The soreness had eased enough that I felt confident heading into the mountains. Sometimes our bodies surprise us when we give them a chance to recover, and this was one of those moments.

Why Mountain Running Means So Much to Me

Mountain running completely changed my relationship with fitness.

Ironically, I hated running when I was younger. I wasn't a fan of hiking either. Looking back, I think it was because I rarely experienced the reward. We'd often turn around before reaching the summit, so I never understood why people loved climbing mountains.

Everything changed in my twenties.

Standing on top of Colorado's peaks gave me a completely different perspective. The quiet, the views, and the feeling of earning every step created something I couldn't find anywhere else. Reaching the summit wasn't just about exercise. It became a reminder that meaningful accomplishments usually require patience and persistence.

That love of mountain running eventually led me into trail running and ultramarathons. Every climb continues to teach me lessons that apply far beyond athletics.

My Plan for Skipping Breakfast

I've never enjoyed eating a large breakfast before an early morning adventure.

Since we planned to start climbing early, I decided to skip breakfast and rely on nutrition throughout the run instead. On paper, I thought I had everything covered.

I packed a banana, a pear, several packs of Skratch energy gummies, plenty of water, sugar free electrolyte mix, and a high carbohydrate drink mix that has served me well during ultramarathons. Altogether, I estimated I had roughly 1,400 calories available during the adventure.

I remember thinking this would be more than enough.

Looking back, I was focused almost entirely on calories and carbohydrates. I assumed that if I had enough fuel available, everything else would take care of itself. That assumption turned out to be my biggest mistake.

Everything Felt Great Until It Didn't

The climb went almost perfectly.

We covered roughly five and a half miles while climbing more than 4,300 vertical feet, and I felt fantastic. My legs were strong, my breathing felt controlled, and we reached the summit in about two and a half hours. Those uphill sections are where I usually feel my strongest.

Then we started descending.

Almost immediately, my body began sending warning signs. My muscles became increasingly tight, my legs started cramping, and my energy steadily disappeared. Instead of confidently running downhill like I normally would, I found myself alternating between jogging and walking.

The entire descent took around two hours, which wasn't terrible by most standards. Still, I knew something wasn't right because this wasn't how my body usually responded on similar mountain runs.

Sometimes your body whispers before it screams. Thankfully, I paid attention before things became much worse.

The Nutrition Mistake I Didn't See Coming

As we continued down the mountain, Brandon asked a simple question.

"What did you have for breakfast?"

When I explained that I had skipped breakfast, another realization hit me almost immediately.

I hadn't really eaten dinner either.

The day before, I'd eaten a huge lunch that left me too full to enjoy a substantial evening meal. Instead, I had yogurt and fruit. While fruit is absolutely a healthy choice, I hadn't consumed enough sodium, substantial carbohydrates, or overall calories leading into a demanding day in the mountains.

It wasn't just about breakfast.

It was about my overall nutrition across the previous twenty four hours. My body wasn't starting from a full tank. It was already operating with limited resources before I ever stepped onto the trail.

The Missing Ingredient Was Salt

The biggest issue wasn't calories.

It wasn't even carbohydrates.

It was salt.

Brandon suggested I take two salt capsules, and within five to ten minutes I felt dramatically better. My legs loosened up, my energy improved, and I was running again. The difference happened so quickly that it was impossible to ignore.

That experience reinforced something I've learned before but hadn't fully respected.

Electrolytes matter.

Hydration matters.

Sodium matters.

When you're spending hours at altitude, your body depends on these nutrients just as much as it depends on calories. Ignoring them can quickly turn a great day into a difficult one.

This Wasn't the First Time I Learned This Lesson

As frustrating as this experience was, it wasn't new.

During the 100 kilometer ultramarathon that I eventually won, I experienced severe salt depletion around mile 37. My leg became so tight that walking was almost impossible. The pain was intense, and I knew something had to change immediately.

I started consuming salt packets, drank pickle juice, and continued replacing electrolytes throughout the remainder of the race.

It worked.

That experience helped me finish strong and eventually cross the finish line first.

You would think that lesson would stay with me forever, but it's surprisingly easy to become complacent. Even experienced endurance athletes occasionally forget the fundamentals. That's why reviewing these experiences honestly is so valuable.

Can You Trail Run 11 Miles Without Eating Breakfast?

So let's answer the original question.

Yes, you absolutely can trail run 11 miles without eating breakfast.

But breakfast isn't the deciding factor.

What matters is whether your body has the carbohydrates, calories, sodium, hydration, and overall nutrition required for the demands of your adventure.

Some athletes perform extremely well training fasted. Others perform much better after eating beforehand. Neither approach is automatically right or wrong. The best strategy depends on your goals, your physiology, the length of your effort, the terrain, the weather, and how you've fueled in the hours leading up to your run.

Instead of copying someone else's routine, learn how your own body responds.

Experiment during training rather than on race day. Keep notes about what works. Adjust one variable at a time. Over weeks and months, you'll build a nutrition strategy that's personalized to your needs.

Focus on Supporting Your Best Performance

One of the biggest mindset shifts I've made over the years is realizing that preparation isn't about perfection.

It's about support.

Every healthy meal, every recovery workout, every good night's sleep, every electrolyte refill, and every smart training decision is another way of supporting the athlete you want to become.

That mindset removes unnecessary pressure while helping you make consistently better decisions.

Your goal doesn't have to be perfection every single day.

Your goal is simply to give yourself the best opportunity to succeed.

That's true whether you're preparing for your first trail run, training for HYROX, chasing an ultramarathon finish, or simply trying to become a healthier version of yourself.

Small improvements, repeated consistently, create extraordinary results over time.

Final Thoughts

Looking back, I'm grateful for this experience because it reminded me that endurance performance is about far more than simply logging miles.

Nutrition, hydration, electrolytes, recovery, and preparation all work together to determine how we feel when the trail gets challenging.

If you're wondering whether you can trail run without breakfast, remember that the better question is whether you've properly prepared your body for the effort ahead.

When you learn to fuel intentionally instead of accidentally, you'll feel stronger, recover faster, and enjoy the journey much more.

If you'd like help building healthy habits that last, I'd love to share my FREE Three Pillars of Healthy Living Guide. In just a few minutes, you'll discover how movement, tracking, and accountability can work together to help you create lasting results. 

No matter where you are on your fitness journey, remember that every smart choice is another step toward becoming the athlete and the person you want to be. I believe you can do more than you think, and I can't wait to see where your next adventure takes you.

DISCLAIMER: THIS INFORMATION IS MY OPINION AND IS NOT INTENDED TO BE A SUBSTITUTE FOR YOUR HEALTHCARE PROVIDER. PLEASE CONSULT A HEALTHCARE PROVIDER FOR GUIDANCE SPECIFIC TO YOUR CASE.