The Athlete Who Only Fuelled the Session

On Tuesday mornings, Sam trained hard.

Intervals before sunrise. Sweat on the track. Watch beeping splits. Heart pounding.
Disciplined.

What Sam didn’t train was his gut.

Breakfast was coffee. Lunch was “something light.” Dinner was protein and salad  “clean.” He told himself he was being efficient. Lean. Race-ready.

On long run days, he’d finally take a gel because that’s what you do on race day.

And every time, at kilometre eight, his stomach would slosh. By ten, it cramped. By twelve, he was scanning for a bathroom and wondering what was wrong with him.

Nothing was wrong.

His gut simply hadn’t been trained.

Your digestive system adapts, just like your muscles.

When you consistently practise carbohydrate intake, the type, timing, and amount you’ll use in competition, gastric emptying improves. Carbohydrate absorption improves. Tolerance improves.

But Sam only fuelled when it counted.

Race day became a shock to the system.

There was another layer.

Hard training diverts blood flow away from the gut and toward working muscles and the skin to keep you cool. In the heat, that shift is even stronger. Add dehydration, and digestion slows further.

Less blood.
Less fluid.
More stress hormones.

And Sam? He was layering intermittent fasting onto high training loads. Saving calories. Keeping carbs low on “easy” days. Calling it discipline.

What it really was: low energy availability.

More training + not enough food = elevated stress hormones, poorer recovery, reduced gut resilience, slower digestion, and a higher risk of GI symptoms.

The week before his half marathon, Sam doubled down.

Extra vegetables. Extra fibre. “Clean up the diet.”

Race morning arrived. His legs felt ready.

His gut did not.

Fibre is essential for long-term gut health but timing matters. Very high-fibre meals in the 24 hours before racing (especially the final pre-event meal) can increase urgency, bloating, and discomfort. This isn’t about cutting fibre forever. It’s about strategy.

The same goes for supplements. Race day is not the time to stack caffeine, concentrated carbohydrates, and new products you’ve never trialled. More is not better. Practise the dose. Practise the timing. Practise in the conditions you’ll compete in.

After that race, Sam changed one thing.

He stopped fuelling the session and started fuelling the day.

Carbohydrates weren’t something he “earned” they were planned. Breakfast wasn’t optional. Lunch wasn’t light “just in case.” He spread carbs across the day so his gut saw them regularly, not in panic doses. He included adequate protein at each meal to support repair and maintain gut integrity. Fluids started early in the morning, not halfway through the run.

He practised with his race gels during long runs. Same brand. Same timing. Same volume. He tested them in heat. He adjusted fluid intake so concentration matched conditions. He timed fibre more strategically before key sessions — not cutting it long term, just easing back before racing.

Most importantly, he stopped under-fuelling.

No more aggressive restriction layered onto high training loads.
No more very low-carb days before big sessions.
No more rigid “clean eating” that quietly blunted his appetite.

Within weeks, things shifted.

His long runs felt steadier. Recovery improved. Mood stabilised. The random bloating faded. His gut stopped feeling like an unpredictable liability and started feeling like part of the team.

On race day, his legs still hurt — that’s normal.

But his stomach was quiet.
His energy was stable.
His focus stayed sharp.

Because performance doesn’t start at the start line.

It starts at breakfast.
And it’s built meal by meal, day by day — long before the gun goes off.