What Every Female Athlete Needs to Know: The Female Athlete Triad and RED-S

You’re training hard. You want to perform well, stay lean, maybe even hit the next level.

But what if your body starts giving you signs something’s off?

• You’re tired all the time.
• Your period becomes irregular—or disappears.
• You keep getting injured or feeling worn down.

These symptoms aren’t random—they could be signs of something called the Female Athlete Triad or Relative Energy Deficiency in Sport (RED-S).

And they’re more common than you think—especially in driven, high-achieving female athletes.

What Is the Female Athlete Triad?

The Female Athlete Triad is a medical condition with three interconnected parts:

1. Low Energy Availability (often from not eating enough for your activity level)
2. Menstrual Dysfunction (missed or irregular periods)
3. Low Bone Mineral Density (weaker bones that are more prone to fractures)

It’s often caused by under-fueling, whether intentional (restricting food) or unintentional (not realizing how much you need to eat to support training).

What Is RED-S?

RED-S (Relative Energy Deficiency in Sport) is a broader, updated version of the Triad. It recognizes that under-fueling affects more than just periods and bones.

With RED-S, athletes may experience problems with:

• Immunity (getting sick more often)
• Mood and focus
• Sleep
• Heart rate and metabolism
• Growth and hormone regulation
• Injury risk and recovery

In other words: under-fueling slows your entire system down.

“You don’t have to look unhealthy to be under-fueled. RED-S is about function, not appearance.”

Warning Signs for Athletes

• You haven’t had a period in 3 months or more
• You feel unusually tired despite sleeping well
• You’re constantly sore or slow to recover
• You’re eating less but not performing better
• You’ve had repeat injuries like stress fractures

These are not normal signs of hard work. They’re signals that your body is missing something it needs—fuel.

What Parents and Coaches Should Know

RED-S and the Triad aren’t just “female athlete problems.” They’re serious medical conditions that can affect health now and into adulthood.

Here’s what you can do:

• Ask about periods in a nonjudgmental way
• Talk about food as fuel, not morality
• Encourage rest and recovery as part of training
• Refer to a physician or dietitian if something seems off
• Avoid comments about weight, shape, or “discipline”

“Discipline isn’t skipping meals—it’s knowing what your body needs to thrive.”

The Good News: It’s Treatable

With proper nutrition, support, and guidance, most female athletes can fully recover from the Triad and RED-S.

Getting help early makes a big difference—physically, mentally, and emotionally.

Final Thought

Strong female athletes aren’t just strong on the outside. They’re strong because they care for their whole system—body, mind, and hormones.

Understanding the Female Athlete Triad and RED-S isn’t just about prevention—it’s about empowerment. Because knowledge is power. And fueling well is one of the most powerful decisions a girl can make for her health and her sport.

References:

• Mountjoy M, et al. “The IOC consensus statement: RED-S.” Br J Sports Med.
• de Souza MJ, et al. “The Female Athlete Triad Coalition consensus statement.” Br J Sports Med.
• de Borja C, Chang CJ, Watkins R, Senter C. “The Female Athlete.” Curr Rev Musculoskelet Med.