You feel tired all the time, but you chalk it up to a heavy training block. Your times are slipping, so you push harder, cutting out snacks to lean down for race season. Then a stress fracture hits. You rest, heal up, jump back into your routine, and break down again. Race, illness, injury, repeat.
If this cycle sounds painfully familiar, you might be dealing with Relative Energy Deficiency in Sport, commonly known as REDs. While this syndrome has gained proper attention in women's sports—largely because a missing menstrual cycle provides an obvious biological alarm bell—male athletes are suffering just as severely while hiding in plain sight. They aren't talking about it, and the sports world isn't listening closely enough.
What is REDs and Why Does It Catch Men Off Guard?
At its core, REDs is what happens when your body doesn't have enough remaining energy to support basic physiological functions after accounting for the massive amount of calories you burn through exercise. It is an energy imbalance. You aren't necessarily starving yourself on purpose. Often, it creeps in because your training volume spikes while your food intake stays flat, or because your hunger signals get suppressed by intense endurance workouts.
Men fall into this trap easily because endurance sports culture glorifies suffering. If you are bonking on long runs or feeling flat on the bike, the typical locker-room advice is simple: train harder, toughen up, or cut more weight to improve your power-to-weight ratio.
That advice is dangerous. When energy availability stays low for weeks or months, your body starts pulling the emergency brake on non-essential systems. It dials down hormone production, compromises bone density, and suppresses immune function.
The Silent Symptoms Men Ignore
Women have a clear diagnostic marker for low energy availability. Men do not. Without an obvious biological warning flag, male athletes often miss the early signs entirely or mistake them for normal training fatigue.
The symptoms manifest in ways that rarely get connected back to the kitchen table:
- Plummeting Testosterone: Low energy availability tanks endocrine health. You might notice a total loss of morning erections, plummeting libido, and a constant lack of drive.
- Recurrent Stress Fractures: When your body lacks fuel, it stops building bone. Repeated injuries in the shins, feet, or hips are screaming red flags, not just bad luck.
- Mental Fog and Mood Swings: Chronic under-fueling alters brain chemistry. Irritability, anxiety, and trouble focusing during the workday are classic indicators.
- Persistent Illness: If every cold that goes around knocks you out for two weeks, your immune system is starved of the raw materials it needs to defend you.
Instead of looking at their plates, most men look at their training logs when performance drops. They double down on the exact behavior that is breaking them down.
The Cultural Pressure to Stay Lean
There is an unspoken rule in endurance sports, cycling, running, and rowing: lighter is faster. Athletes constantly chase a leaner physique to shave seconds off their personal bests.
Unfortunately, this obsession frequently crosses the line into disordered eating habits or unintentional chronic under-fueling. You skip breakfast to get a fasted morning run in. You avoid carbohydrates after lunch because you read an article about metabolic efficiency. You view food strictly as fuel to be earned rather than basic human sustenance required for life.
When you treat your body like an engine running on fumes, it will eventually seize up. The tragedy is that many male athletes push through the warning signs for years, sacrificing their long-term bone health, metabolic function, and mental well-being for a marginal gain on race day.
How to Break the Cycle
If you suspect you are caught in the loop of chronic under-fueling and repetitive injuries, you have to shift your perspective from training harder to fueling smarter. Recovery isn't just about passive rest; it requires an active surplus of energy.
Stop treating carbohydrates as the enemy. Increase your caloric intake gradually over several weeks, focusing heavily on nutrient-dense meals that support your weekly training mileage. If the thought of eating more food brings up anxiety or fear about gaining weight, you need to talk to a sports dietitian or a medical professional who understands REDs.
Listen to your body when it whispers before it starts screaming. Drop the machismo, look at your nutrition honestly, and give your body the fuel it deserves.
