Life as an Endurance Athlete Without a Thyroid
For a long time, my blog has been a place where I simply shared life as it happened — training runs, races, teaching classes, raising kids, and chasing big endurance goals.
But today I want to start something new with it.
Or maybe I should say… start again.
Because there is one question people ask me more than almost anything else:
“How are you doing Ironman races without a thyroid?”
It’s a fair question.
Back in 2005 my thyroid was removed. For many people, that kind of diagnosis changes everything. Energy levels change. Metabolism changes. Doctors often encourage people to slow down and manage their health carefully.
But before I go any further, it helps to understand something important.
What Is the Thyroid?
The thyroid is a small, butterfly-shaped gland located in the front of your neck. Even though it’s small, it plays a very big role in how your body functions.
The thyroid produces hormones that help regulate many of the body’s most important systems, including metabolism, energy levels, body temperature, heart rate, and how your body uses nutrients for fuel.
In simple terms, the thyroid acts like a control center for how your body uses energy.
When the thyroid is working normally, it releases hormones that help keep your body balanced. These hormones influence how quickly your body burns calories, how your muscles recover after activity, and even how alert or tired you feel throughout the day.
When the thyroid is removed, the body can no longer produce those hormones on its own. That’s why people without a thyroid rely on medication such as T3 and T4 to replace the hormones the thyroid would normally produce.
These medications help regulate metabolism and energy, but they don’t always perfectly mimic the body’s natural rhythm.
That’s why people living without a thyroid can sometimes experience challenges with fatigue, metabolism, weight management, and recovery.
And while there’s truth in all of that, I also discovered something else along the way.
The human body is incredibly adaptable.
Since losing my thyroid, I’ve gone on to run marathons, complete Ironman races, train for endurance challenges, and continue doing what I love most — moving my body and helping others move theirs.
Has it been easy?
Not always.
There are days when energy crashes harder than expected. Days when fueling feels like a science experiment. Days when medication timing, hormones, recovery, and training all seem to collide at once.
But there’s also something powerful that happens when you stop seeing your body as broken and start learning how it works.
You adapt.
You listen more closely.
You learn patience.
And you realize that limits aren’t always where we think they are.
For years I’ve quietly lived this life — training, racing, coaching, and teaching fitness classes in my community.
But recently I started thinking about something.
There are so many people out there dealing with thyroid issues who believe their athletic days might be over.
Maybe they were told to slow down.
Maybe they feel like their body doesn’t respond the way it used to.
Maybe they simply don’t see anyone showing what’s still possible.
So, I’ve decided to use this space a little differently moving forward.
IronSunshine will still be about endurance, racing, and life — but I’ll also start sharing what it actually looks like to train, fuel, and compete as an athlete without a thyroid.
The good days.
The frustrating days.
The lessons learned from thousands of miles and countless workouts.
If you’re someone navigating life without a thyroid, I hope this space reminds you that your body is still capable of more than you might think.
And if you’re simply someone who loves endurance sports and the lessons they teach us, I’m glad you’re here too.
Because at the end of the day, endurance isn’t just about racing.
It’s about continuing to move forward — even when progress feels small.
Because a small step still takes you forward.
— Danniela
IronSunshine ☀️
#NoThyroidAthlete
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