On-Bike Eating: How to Eat Without Losing Watts

Most cyclists can tell you how many carbs they should be eating per hour. Far fewer can actually get that food in while riding at tempo in a group, on a rough road, with one hand on the bars and the wind trying to take the wrapper. On-bike eating is a skill in its own right, and it is the reason so many well-planned fuelling strategies fall apart somewhere around hour three. The plan said 80g an hour. Reality was a half-eaten bar in a back pocket and a bonk on the last climb.

The good news is that eating on the bike is trainable, and the fixes are mostly practical rather than physiological. Get the food format right, get the timing right, and rehearse the mechanics until they are automatic. Do that and you stop dropping off the wheel every time you reach for a pocket. This guide walks through what actually works, drawn from years of getting it wrong on Scottish sportives and club runs.

Why On-Bike Eating Costs You Watts in the First Place

Every time you sit up, take both hands off the bars and wrestle with a wrapper, three things happen. Your cadence drops, your aerodynamic position goes, and if you are in a group you drift back a wheel or two and have to close the gap. Individually these are trivial. Over a five-hour ride where you should be eating 15 to 20 times, they add up to real fatigue and a lot of surges you did not need to make.

There is also a digestion cost. The gut needs blood flow to absorb carbohydrate, and blood flow to the gut drops sharply above roughly 80 percent of your threshold. Eat a big lump of food at the bottom of a climb and it sits there doing nothing useful, and often makes you feel worse. So on-bike eating is not just about the mechanics of getting food in, it is about getting it in at moments where your body can actually use it.

The target is the same as it always is. Around 60g of carbohydrate per hour for rides of two to three hours, and up to 90g per hour on longer or harder days, provided you have trained your gut and are using a glucose to fructose blend. The question is how to hit those numbers without it becoming a fight.

Food Format Matters More Than You Think

The single biggest improvement most riders can make is to stop relying on food that requires two hands and a stationary bike to eat. A wrapped bar is fine at a cafe stop. On a descent in the rain it is close to useless. Think about each option in terms of how many hands it needs and how many seconds it takes.

• Gels are one-handed and fast, but they are a single 20 to 25g hit, the wrappers are messy, and many riders find that six or more in a ride starts to turn the stomach. They also need water alongside them.
• Bars pack the most carbohydrate per gram, but they are slow to chew, hard to open, and dry in the mouth when you are breathing hard. Best kept for the easy first hour or the flat section after a cafe stop.
• Drink mix is the easiest of all to consume while riding, but you can only carry so many bottles, and on a cold day you simply will not drink enough to hit your carb targets through fluid alone.
• Chews and pastilles sit in the sweet spot. Each piece is a small, predictable dose, you can eat one every few minutes with one hand, and they need almost no chewing or washing down. Decant them into an open pocket or a top-tube bag and the wrapper problem disappears entirely.

The practical takeaway is that little and often beats big and rare. A pastille every eight to ten minutes delivers a steady stream of carbohydrate the gut can cope with, keeps blood glucose flat rather than spiking, and never requires you to sit up and lose position. This is the eating pattern the professional peloton has moved towards, and it works just as well for a Sunday club run.

Timing: When to Eat on the Bike So It Actually Absorbs

Once the food is easy to reach and easy to eat, the next lever is timing. A few rules have served me well.

• Start early. Eat within the first 20 minutes of a long ride, before you feel like you need to. The rider who waits until hunger hits is already 30 to 40 minutes behind on absorption.
• Eat before the climb, not on it. Take on food in the last few minutes of a flat or rolling section, when intensity is low and the gut is well perfused. By the time you hit the steep bit, that carbohydrate is already on its way into the bloodstream.
• Use descents and tailwinds. These are free eating windows. Your heart rate drops, the group relaxes, and nobody is going to attack. Get two or three pastilles in.
• Set a timer. Most head units let you set an alert every 15 or 20 minutes. It sounds basic, but on a hard group ride you will simply forget, and the beep removes the decision.

One more thing: pair your food with sips of water. Even chews absorb faster with fluid in the stomach, and dehydration slows gastric emptying. A mouthful after every couple of pastilles is enough.

The Mechanics: Practising On-Bike Eating Until It Is Automatic

Nobody is born able to open a pocket, grab a chew and eat it at 35km/h in a bunch. It is a skill, and like cornering or descending it improves with deliberate practice. A few habits that make a real difference:

• Pre-open everything before you roll out. Tear wrappers, decant pastilles into a top-tube bag or a small resealable bag with the top folded over. The goal is that every piece of food is reachable and edible with one hand in under five seconds.
• Use the same pocket every ride. Food in the middle pocket, tools on the right, phone on the left, or whatever works for you. Consistency means you never have to look down or feel around.
• Practise on solo rides first. Get comfortable eating one-handed on quiet roads, then in a small group, then in a fast bunch. Work through the progression rather than trying it for the first time at a sportive.
• Move to the back of the group to eat. If you are riding with others, drift to the rear, get your food in, then move back up. Nobody minds, and you are not risking a swerve at the front.

When on-bike eating stops being an event and becomes a background habit, you free up attention for the riding itself.

What We Use at FTP Endurance Fuel

We built our pastilles specifically around the problem described in this article. Each piece delivers around 4g of carbohydrate in a 1:1 glucose to fructose ratio, which means the dosing is simple: roughly one pastille every five minutes gets you close to 50g an hour, and one every three to four minutes takes you towards 80 to 90g. They are small enough to eat one-handed in a bunch, soft enough to need no real chewing, and they hold their texture in the cold, which matters more than you would think on a Scottish winter ride.

Most of our riders decant from the Mixed Fruit 1kg bag into a top-tube bag or a jersey pocket for the day, which works out considerably cheaper than individually wrapped gels and creates no litter on the road. The Tart Cherry version is the one I reach for on long days, because the sharper tart cherry flavour cuts through the sweetness fatigue that sets in after hour four. If you want real Montmorency tart cherry, it's in Power Fluids (3g per serving).

Eating on the bike well is one of the cheapest performance gains available to any cyclist. You do not need a new bike or a power meter, just food you can eat with one hand, a timer on your head unit, and a few rides of practice until it becomes second nature. If you want to try the little-and-often approach without committing to a full bag, the Taster Pack is the easiest place to start. Take it on your next long ride, set a 15-minute alert, and see how different the last hour feels.