A few years ago I had a training block that looked perfect on paper. Every session ticked off, every long run done, consistency I was actually proud of. And I still felt flat, heavy-legged, and honestly a bit over it by week four.

Turns out the problem wasn’t my training. It was that I was training like an athlete and eating like someone who forgot she had a body to fuel. Toast for breakfast, a sad desk lunch, then wondering why my legs had nothing left for the evening session. Sound familiar?

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Food Isn’t A Side Note To Your Training. It’s Half Of It.

Here’s the bit nobody tells you when you start running or cycling seriously: the session is only half the work. Training breaks your body down — a little muscle damage, depleted glycogen stores, and a stressed system that needs resources to repair. Food is where the actual adaptation happens. You don’t get fitter from the run itself. You get fitter from what you do after it, and that starts with what’s on your plate.

Skip that part, and you’re basically doing the hard bit of training over and over without ever cashing in the reward. That’s not discipline. That’s just leaving progress on the table.

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What Under-Fuelling Actually Feels Like

Not enough people talk about what this actually feels like day to day, so here’s the honest version:

• Sessions that should feel manageable suddenly feel like wading through wet sand
• Being irrationally snappy with your family for no obvious reason (hello, low blood sugar)
• Waking up tired no matter how much you slept
• Niggles and little injuries that just won’t fully go away
• Hitting a plateau even though your training log looks solid

If any of that sounds familiar, it’s not a mental toughness problem. It’s very often a plate problem. And the fix is rarely complicated — it’s just consistent.

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The Boring Stuff That Actually Works

None of this is exciting, and that’s kind of the point. The people who fuel well aren’t eating anything magic — they’re just doing the basics, consistently, without overthinking it:

• Eat enough carbs. They’re not the enemy — they’re literally what your muscles run on. Under-carb a training block, and you’ll feel it within a week.
• Refuel within the hour. That post-session window is when your body is primed to absorb what you give it. A banana and some yoghurt beats nothing, every time.
• Drink before you’re thirsty. By the time you feel thirsty, you’re already behind. Sip consistently through the day, not just around sessions.
• Don’t save your appetite for after training. Skipping meals to “make room” for a big dinner just means you’re running on empty all day.
• Plan it, so you’re not deciding at 6 pm when you’re starving. This is the one that trips up almost everyone — decision fatigue after a long day is real.

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I Built The Plan I Wish I’d Had

Honestly, the hardest part was never knowing that I should eat better. It was the daily admin of figuring out what to eat, in what order, around training that didn’t always stick to a tidy schedule. So I built the plan I wish someone had handed me years ago.

It’s 30 days of breakfast, lunch, dinner and snacks, tagged by training-day type so you always know when to load up and when to ease off. Full hydration targets. Grocery lists with actual quantities, so Sunday shopping takes ten minutes instead of forty. And a proper race-week and event-day section for when it really counts.

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The Takeaway

Your training plan gets all the attention because it’s the visible part — the sessions in your calendar, the kays in your legs. But the meals you don’t think twice about are doing just as much work, quietly in the background. Give them a bit of the same intention you give your training, and you’ll feel the difference faster than you’d expect.

You don’t have to overhaul everything overnight. Start with one meal, done properly and consistently. The rest builds from there.

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🩷The Endurance Diaries🩷