Are Young Athletes Sacrificing Performance for Aesthetics? The Rise of GLP-1’s and Retatrutide in Sports

Over the last few years, weight loss medications have gone from medical clinics to mainstream culture.

What started as treatment for obesity and diabetes has quickly entered conversations in gyms, club sports, locker rooms, and increasingly among high school athletes. You heard that right - high school.

As a sports physical therapist, I have had conversations with athletes who are not pursuing these medications because of obesity or medical necessity.

Their goal is simpler.

They want visible abs.
They want to get lean for summer.
They want to look shredded.

What many of them may not realize is that the body composition changes they are chasing may sometimes come at the expense of the exact athletic qualities they have spent years training to build.

What Are GLP-1 Medications and Retatrutide?

GLP-1 medications work by mimicking a hormone naturally produced in the intestine called glucagon like peptide 1.

GLP-1 signaling:

• Slows stomach emptying
• Increases feelings of fullness
• Reduces hunger signals
• Improves blood sugar regulation

This combination often results in meaningful weight loss.

Retatrutide goes a step further.

Retatrutide is considered a triple agonist because it activates:

• GLP-1 receptors
• GIP receptors
• Glucagon receptors

Early research suggests this combination may produce even greater reductions in body weight.

That sounds appealing.

Especially for teenagers surrounded by social comparison and pressure to look a certain way.

But athletes are not typical weight loss patients.

Athletes Are Not Trying to Become Smaller. They Are Trying to Become Better.

Most conversations around GLP-1 medications focus on improving metabolic health.

Young athletes are different.

Their body is trying to do several things at once:

Grow.
Recover.
Build muscle.
Increase bone mass.
Develop tendon capacity.
Improve force production.
Adapt to training.

That process requires energy.

Calories are not just fuel.

They are raw material.

During adolescence, the body is in one of the most important developmental windows of life.

Growth is expensive.

Weight Loss Is Not Just Fat Loss

This is the part many athletes miss.

When body weight drops rapidly, the body rarely loses pure body fat.

Lean tissue can be lost too.

That may include:

Muscle mass
Water
Glycogen stores
Potential reductions in training quality

Studies in adults using GLP-1 based medications have shown that some portion of total weight loss comes from lean mass, although adequate protein intake and resistance training appear to reduce that effect.

That distinction matters.

For someone improving metabolic health, some lean mass loss may still represent an overall positive outcome.

For a competitive athlete, the equation changes.

Because athletes do not compete based on scale weight.

They compete based on output.

The Hidden Performance Tradeoff That Young Athletes May Not Realize

This is not an argument that GLP-1 medications or retatrutide automatically harm athletic performance.

Many individuals can maintain performance successfully.

The concern is different.

Healthy adolescent athletes using these medications primarily for appearance may unintentionally create conditions that work against the exact adaptations they are trying to achieve.

Many athletes assume:

Lower body fat = better athlete.

But performance is more complicated than aesthetics.

If appetite decreases significantly and food intake drops without intentional nutrition support, the body may not have enough resources to fully support:

Training adaptation.
Recovery.
Muscle development.
Power output.

For overhead athletes, this can become especially relevant.

The pitcher chasing velocity.

The baseball player trying to throw harder.

The hitter trying to increase bat speed.

The athlete who spent years building strength.

They may become lighter.

But lighter does not always mean more explosive.

Lower lean mass or under fueling may show up as:

Reduced force production.
Lower strength.
Less training tolerance.
Reduced power output.

And eventually that may become:

Lower pitch velocity.

Less carry on throws.

Reduced arm strength.

Less bat speed.

Lower exit velocity.

Sometimes the athlete ends up saying:

“I look leaner… but I don't feel as athletic.”

Not because the medication directly made them weaker.

But because the body was not adequately fueled to support growth, recovery, and performance.

Adolescence Is Not the Time to Under Fuel

One of my biggest concerns is not necessarily the medication itself.

It is the context.

Many high school athletes already struggle to eat enough.

Breakfast gets skipped.

Protein intake is inconsistent.

Practice schedules compress meals.

Recovery nutrition becomes an afterthought.

Now add a medication designed to suppress appetite.

For some athletes, that may unintentionally amplify an already existing problem.

Less food.

Less recovery.

Less adaptation.

Potentially less performance.

This Is Not A Slam Piece of GLP’s & Reta

GLP-1 medications and newer agents like retatrutide may become transformative tools for people with obesity and metabolic disease.

That is not the issue.

The concern is when healthy young athletes begin using powerful appetite suppressing medications primarily for appearance while unintentionally compromising performance and development.

The question should not be:

“How fast can I get lean?”

The better question is:

“What body composition allows me to perform at my highest level?”

Because most athletes do not spend years training to become smaller.

They train to become better.

And sometimes those goals are not the same thing.