Can Athletes Have Heart Disease? Why Training Alone Isn’t Enough

By Barbara Lewin, RDN, LDN Sports and Functional Nutritionist

Many athletes believe one thing without ever saying it out loud:

“I work out hard, I’m lean, so my heart must be healthy.”

It makes sense. You train regularly. Your weight is stable. Your resting heart rate is low. People tell you that you’re “in great shape.”

But every February-Heart Health Month-it’s worth repeating an important truth:

Athletes can have heart disease. And exercise alone doesn’t cancel out diet, genetics, or lab markers.

Yes, Athletes Can Have Heart Disease

Being fit lowers risk, but it does not eliminate it.

Heart disease is influenced by:

• Diet quality

• Cholesterol levels

• Blood sugar control

• Inflammation

• Family history

• Stress and recovery

You can be fast, strong, and lean-and still have risk building quietly over time.

That’s why we sometimes see headlines about “fit people” having heart attacks. The outside looks healthy, but the inside tells a different story.

Fitness and Heart Health Are Not the Same Thing

This is where athletes often get tripped up.

• Fitness is about performance: pace, power, endurance.

• Heart health is about your blood vessels, cholesterol, and metabolism over decades.

You can improve fitness quickly.
Heart health is built slowly-or damaged slowly-depending on your habits.

The Myth: “I Can Eat Whatever I Want Because I Train”

This belief is common in endurance and competitive sports.

Training becomes a free pass to:

• Eat lots of processed foods

• Rely heavily on sugar and refined carbs

• Ignore fat quality

• Skip fiber and vegetables

Burning calories does not protect your arteries from poor inputs.

Exercise improves blood sugar control for a short time.
Diet shapes cholesterol, inflammation, and vascular health long-term.

Why Athletes Miss Early Warning Signs

Most athletes track:

• Training volume

• Body weight

• Performance metrics

But early heart risk doesn’t show up there.

Common Red Flags That Get Overlooked

• High LDL or ApoB despite normal weight

• Elevated triglycerides

• Borderline blood sugar

• Strong family history of heart disease

• “Normal” labs that haven’t been looked at closely

Feeling good and performing well does not always equal low risk.

What the Research Tells Us

Studies consistently show:

• Exercise lowers heart disease risk, but does not erase it

• Diet quality matters even in very active people

• Lean individuals can still have insulin resistance

• Endurance athletes can develop artery plaque, especially with poor diet or genetics

The takeaway is simple:

Exercise is protective, not a guarantee.

Nutrition Mistakes Athletes Make That Affect the Heart

1. Too Many Refined Carbs Outside Training

Sports drinks, bars, and white grains have a place—but all day, every day adds stress to blood sugar and triglycerides.

2. Ignoring Fat Quality

High intakes of saturated fat and fried foods can raise cholesterol particle numbers, even in fit people.

3. Not Enough Fiber

Fiber helps lower cholesterol and improve gut and heart health. Many athletes fall far short.

What Heart-Healthy Eating Looks Like for Athletes

This is not about dieting or cutting fuel.

It’s about fueling with intention.

Heart-Smart Athlete Basics

• Carbs matched to training intensity

• Plenty of vegetables and fruit

• Beans and lentils for fiber

• Fatty fish like salmon

• Olive oil, nuts, and seeds

• Protein spread evenly across meals

You can support performance and long-term health at the same time.

Labs Athletes Should Pay Attention To

Scale weight is not enough.

Athletes should understand:

• LDL cholesterol and ApoB

• Triglycerides

• Fasting glucose and A1c

• Blood pressure trends

• Family history of early heart disease

These numbers often tell the story long before symptoms appear.

Where an Introductory Session Fits In

Many athletes come to me thinking they need:

• A meal plan

• Better race fueling

What they actually need first is clarity.

An Introductory Session is where we:

• Review your training, diet, and history

• Look at labs through an athlete lens

• Identify hidden heart health risks

• Decide what matters now—and what doesn’t

No pressure. No generic advice. Just a clear plan forward.

👉 You can learn more about the Introductory Session here:
sports-nutritionist.com/virtual-session-special

The Bottom Line

Training hard is a gift to your heart-but it’s not a free pass.

Athletes who want to stay strong for decades:

• Eat with purpose

• Respect recovery

• Pay attention to labs

• Don’t assume leanness equals protection

Heart Health Month is a good reminder:

Train for performance today-and health for the long run.