RED-S in Austin: Why Underfueling Is a Rising Problem in Texas Endurance Culture
If you live in Austin and you train, you've seen the same scene play out for years. Lady Bird Lake at 6 a.m. Riders heading west on 360. People spilling out of BlackSwan at 9 p.m. with a banana and a protein bar between them and tomorrow's class. Bouldering, gravel, trail, triathlon, F45, hot yoga, CrossFit, ultra-everything.
It's a great training city. It's also one of the easier cities in the country to develop Relative Energy Deficiency in Sport, also known as RED-S, and not realize it.
What RED-S actually is
RED-S is what happens when your body chronically doesn't get enough energy to cover both your training and the basic biological functions you'd run anyway (heartbeat, hormones, immune system, bone remodeling, mood, focus). It's not the same thing as an eating disorder, though eating disorders can drive it. Plenty of athletes with RED-S are unintentionally eating less than they're burning, sometimes by a lot, for months or years.
The updated 2023 IOC terminology technically calls it "REDs" (Relative Energy Deficiency in Sport). Most clinicians and athletes still say RED-S. Same thing.
Two things to know up front:
RED-S is not a gender issue. The original "Female Athlete Triad" framing left a generation of any non-female endurance athletes under-diagnosed. People (all of ‘em), get RED-S. Cyclists, runners, climbers, swimmers, lifters cutting weight, triathletes. You name it.
RED-S is not a body-size issue. You can have it at any weight. What you see on the outside doesn't tell you whether your hormones, bones, and recovery are getting what they need on the inside.
Why Austin is seeing more of this
Austin's training scene has scaled up faster than most American cities. A handful of things stack:
A year-round outdoor culture, meaning most athletes never have a real off-season.
An enormous endurance community: Austin Marathon, Cap10K, Rogue, Gilbert's Gazelles, Austin Runners Club, the local tri clubs, Jack & Adam's, BPN, Hill Country gravel.
Wellness culture, where "eating clean" is socially praised even when it crosses into restriction.
F45, Barry's, Orangetheory, CrossFit, hot yoga, and other high-intensity formats that quietly demand a lot of fuel.
A heat profile that increases sweat losses for half the year and drops appetite right after sessions (exactly when you need to be eating btw).
A young, performance-oriented professional demographic that's used to optimizing.
None of this is a problem. It's just a profile that produces a lot of underfueled athletes. And because everyone around them is also underfueled, "normal" stops being normal.
What RED-S can look like
Most of the early signs are easy to ignore or chalk up to "I'm just tired." A partial list:
Stress fractures, recurrent injury, slow soft-tissue healing
A lost period in menstruating athletes, or irregular cycles
Low libido and reduced morning erections in male athletes
GI complaints, especially on long efforts
Frequent low-grade illness
Mood drift: irritability, blunted motivation, "I love this sport but I dread training" feelings
Sleep that's poor despite training hard
Plateaued or backsliding performance even though training load is up
Always cold, even in Austin in July
Cravings that suddenly intensify in the evening
Resting heart rate that's lower than it should be in a way that isn't fitness
You don't need to have all of these. Stress fractures plus a missing period in a runner is one classic pattern. Recurring colds plus low libido plus declining wattage in a cyclist is another. There are dozens of patterns.
Why it gets missed
A few reasons.
Athletes often underestimate their intake needs, or don't fully grasp their long-day expenditure. Coaches focus on training load, not fueling. Primary care providers sometimes don't connect a stress fracture in a 32-year-old man to a 2,500-calorie diet against a 5,000-calorie burn. And the wellness narrative in Austin specifically often praises the very habits that cause RED-S: lean eating, fasted training, low-carb endurance, shrinking bodies, restriction.
A real fueling assessment from a sports-trained dietitian usually catches it quickly. We're not guessing.
What treatment looks like
Step one is always fueling adequacy, not body composition. You can't recover from RED-S on a diet. The plan typically includes:
Restoring energy availability, often through more frequent eating windows around training rather than huge meals
Repairing the post-session window, which is where most underfueling happens in this town
Coordinating with your physician on bone health, hormones, iron, and labs that matter
Eventually re-introducing performance goals once your body is actually able to adapt to training again
For some athletes, RED-S is a wake-up call about an eating disorder underneath the surface. For others, it's purely a knowledge gap. Both deserve real, non-shaming care.
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No. Recreational athletes training at high volume in Austin's outdoor scene develop RED-S all the time. You don't need a race number to be underfueled.
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Often, yes. We're in-network with Aetna, BCBS, and UnitedHealthcare. Coverage varies by plan, and we can help you check your benefits.
At Khan RD, we work with Austin endurance athletes on RED-S recovery, fueling, and sustainable performance nutrition. We're in-network with Aetna, BCBS, and UnitedHealthcare.
The content of this blog does not serve as medical advice.
