Pre-ride nutrition: why your three-hour ride is costing you the rest of the day

An athlete messaged me last week. He'd done three hours at 220W — a solid upper endurance effort, the kind of ride that should leave you tired but functional. Instead he felt irritable and wiped out for the rest of the day. Here's what he'd eaten:

Before: three slices of wholemeal bread with peanut butter, Greek yoghurt, a banana. During: 180g of carbs in his drink mix across the three hours. After: 30g carbs and 30g whey protein immediately post-ride.

He asked whether he should have eaten more for breakfast or during the ride.

The answer is yes — but not just one of those things. He underfuelled at all three points. Not dramatically, and not through any obvious mistake. He was doing what most experienced cyclists do. The problem is that what most experienced cyclists do isn't enough.

Before the ride: closer than you think, but not quite there

Let's do the maths on his breakfast. Three slices of wholemeal bread is roughly 45g of carbs. Add a banana at around 25g and you're at approximately 70g total carbohydrate, plus protein from the yoghurt and peanut butter. That's not a bad breakfast. But consider what was coming: three hours at 220W, which for this rider sits at around 77% of FTP. Sustained, meaningful work. Total energy expenditure somewhere around 2,400 kcal.

70g of pre-ride carbs is a reasonable start, not a complete preparation. For a ride of this length and intensity, you want to arrive at the start line with your glycogen stores properly topped up — not half-stocked.

Here’s what I'd suggest instead:

Four slices of toast with a tablespoon of jam on each slice (roughly 110g carbs), 200g of 0% Greek yoghurt (20g protein), a banana (20g carbs), a tablespoon of peanut butter, a tablespoon of honey, a glass of orange juice, and — non-negotiable — coffee :-).

That puts you closer to 180-200g of carbs pre-ride with solid protein. It sounds like a lot. It is a lot. That's the point. You're about to spend three hours at a decent clip. Eat accordingly.

During the ride: the number everyone uses is out of date

He took 180g of carbs across three hours — 60g per hour. He mentioned this was his usual target. It's a number that gets repeated constantly, because for a long time it was the consensus recommendation.

The problem is that at sustained tempo intensity over three hours, 60g/hr is the floor, not the target. Your gut can absorb more, and at that output, you need more. Current evidence supports 80-90g/hr for efforts of this duration and intensity, particularly when using a glucose-fructose mix which allows multiple intestinal transport pathways to work simultaneously.

The practical difference between 60g/hr and 80g/hr over three hours is 60g of carbohydrate — roughly one and a half gels, or a few extra scoops in the bottle. It's not a dramatic change to make, but it meaningfully affects how you feel in the final hour and, critically, how much glycogen you've burned through by the time you finish.

Train your gut gradually if you're not used to higher intakes. But 60g/hr as a ceiling for a serious three-hour ride is selling yourself short.

After the ride: this is where it went wrong

30g of carbs after a three-hour 220W effort is close to nothing.

Think about what's just happened. You've burned through approximately 2,400 kcal. Your glycogen stores are heavily depleted. Your muscles are primed to absorb carbohydrate — the 30-60 minute post-exercise window is real, and the uptake rate during this period is significantly higher than at rest.

Into that window, he put 30g of carbs. That's a banana. That's not recovery nutrition — that's a snack.

The afternoon irritability and fatigue weren't a mystery. They were the predictable result of a significant glycogen deficit that never got addressed.

Here's what post-ride nutrition should look like after a three-hour effort at this intensity:

Immediately after finishing: a shake with 30g protein and 30g carbs is a good start — keep that. But follow it within 30 minutes with a proper carbohydrate hit: a bowl of cereal with 100g of Greek yoghurt gets you another 50g carbs and 10g protein. And, fluid — you’ll almost certainly be (slightly) dehydrated, after training. Then eat a normal meal within two hours.

The principle is simple: the ride created a hole. Your job in the two hours after finishing is to fill it. A protein shake alone doesn't fill it.

The numbers in one place

For a three-hour ride at tempo intensity:

Before — aim for 150-200g of carbohydrate in your pre-ride meal, 2-3 hours before you start.

During — 80-90g of carbs per hour, ideally from a glucose-fructose mix.

After — protein shake immediately, followed by 50g+ of carbs within 30 minutes, then a full meal within two hours.

My athlete’s ride was fine. His fitness is fine. The fatigue that followed wasn't a training problem — it was a fuelling problem, and it's one that's straightforward to fix.

Want to know your specific numbers?

Carbohydrate needs vary with body mass, intensity, and duration. The CycleCoach Nutrition Calculator gives you your individual daily targets based on your actual training load — not generic guidelines.

If you want to go further and apply this to your training week consistently, this is exactly the kind of thing we work through in The Collective — structured coaching, monthly Q&As, and a community of cyclists over 40 who are serious about getting this right.