Last week one of our founders was out at a race this past weekend, chatting with some of the riders at the starting line. One athlete was complaining about severe stomach issues during his recent events. He mentioned something his doctor had told him: "During a race, all your blood goes to your brain and your legs, leaving your gut behind."
His doctor hit the nail on the head.
If you are an endurance athlete, whether you're crushing gravel, pounding pavement, or swimming open water, you’ve likely experienced some level of gastrointestinal (GI) distress. From bloating and cramping to the dreaded mid-race sprint to the porta-john, GI issues are one of the leading causes of a DNF (Did Not Finish).
But why does this happen, and more importantly, how do we fix it? Let’s talk about why you can’t leave your gut behind on race day.
The Science: Why Your Gut Goes Dark
When you exercise at a high intensity, your body enters a mild state of "fight or flight." Your sympathetic nervous system takes over, and your body makes a rapid executive decision: What organs need the most oxygen right now?
The answer is your working muscles (like your legs) to keep you moving, your heart to pump the blood, and your brain to keep you focused.
To supply these VIP organs, your body literally shunts blood away from your digestive tract. In fact, during intense exercise, blood flow to your gut can drop by up to 80%.
The Problem: Fueling a Sleeping Stomach
Here is where the trouble starts. To maintain energy during a long race, you have to consume calories. But if you dump heavy, complex, or hard-to-digest fuel into a stomach that currently has zero blood flow to process it, that food is just going to sit there.
When undigested food and fluids sit stagnant in the gut, they ferment, slosh around, and draw water into the intestines. This leads to nausea, cramping, and sudden bathroom emergencies.
The Solution: You Need to "Train Your Gut"
You can’t stop your body from prioritizing your legs, but you can train your digestive system to handle the stress. Just like your legs, your gut needs a dedicated training plan to perform on race day. Here is a three-part approach to training your gut for maximum resilience:
1. The Foundation: Feed and Seed Training your gut starts long before you clip into your pedals or lace up your shoes. To build true biological resilience, you need a daily "feed and seed" approach. You must "seed" your gut with the right clinically studied probiotics (our Base formula) and "feed" those good bacteria with targeted prebiotics (our Fuel formula). A healthy, robust microbiome is naturally more capable of absorbing nutrients and fighting off inflammation under the stress of endurance sports.
2. Practice Under Pressure If you only eat high quantities of carbs on race day, your stomach will panic. You have to practice your exact race day nutrition strategy during your hardest, longest training sessions. By combining our daily synbiotic protocol with on-the-bike fueling practice, your stomach will physically adapt to processing calories even when blood flow is low.
3. Keep it Simple and Hydrated When blood flow drops, your gut doesn't have the energy to break down complex fats, proteins, or heavy fibers. Stick to easily digestible, simple carbohydrates. Additionally, sip water and electrolytes consistently. As you lose fluid through sweat, your blood volume decreases, which means blood flow to your gut drops even further. Proper hydration keeps the system moving.
The Takeaway
Your legs might be doing the heavy lifting, but your gut is the engine room that keeps them firing. Don't wait until race day to find out your nutrition plan doesn't work. Train your gut from the inside out and give your microbiome the daily support it needs to thrive under pressure.
Choose Your Protocol Today Ready to push your limits and start training your gut? Select our foundational daily synbiotic or map your exact microbiome for a custom-engineered performance solution:
-
Element Daily Essentials: The foundation for athletic resilience. A targeted probiotic and prebiotic synbiotic designed to optimize gut flora, manage training inflammation, and sustain your daily energy. Starts at $98.49.
-
Personalized Protocol: The ultimate precision approach for athletes. Includes our at-home Microbiome Analysis Kit to map your gut's recovery markers, unlocking a custom formulation engineered for your exact biological needs. Starts at $449.00.