Gels or Chews for Runners: Which Works Best?

At 75 minutes into a long run, the question is rarely what tastes nicest. It is whether you can take in enough carbohydrate without breaking rhythm, upsetting your stomach or missing your target. For gels or chews for runners, the better choice is the format you can consume consistently at race effort, with enough fluid and enough carbohydrate to support the work ahead.

Both formats can work extremely well. Neither is automatically faster, cleaner or easier on the gut. The useful decision is more precise: choose the delivery method that fits your event duration, intensity, carrying plan, fluid access and tolerance.

"After the 2012 Olympics I analysed every decision I'd made in the race — pacing, line choice, when to make a move. The nutrition plan barely featured because it was automatic. Same gels, same timing, same water at the same points. That's what you're building when you practise your fuelling in training. Not a strategy. A reflex."
— Alistair Brownlee, Two-time Olympic Triathlon Champion and founder of truefuels

Gels or chews for runners: the short answer

Gels are usually the most efficient option when speed and simplicity matter. They deliver a measured carbohydrate dose in a small packet, require no chewing and are easy to take during hard running. That makes them particularly useful for marathons, hilly races, fast long runs and any session where breathing is already under pressure.

Chews suit runners who prefer to spread their intake across a longer period. A chew can be taken one piece at a time, which may feel more manageable when a full gel seems too sweet or too concentrated. They can also offer welcome texture when repeated gels create flavour fatigue.

The trade-off is practical. Chews take longer to eat, need more attention and can be awkward when your mouth is dry or your pace is high. Gels can be swallowed quickly, but they are not a substitute for a hydration plan. If a gel is designed to be taken with water, take it with water.

Carbohydrate delivery matters more than format

Your body does not reward a gel because it comes in a gel packet. It responds to carbohydrate delivered at a rate your gut can absorb and your muscles can use. A product format is simply the vehicle.

For many endurance sessions, 30–60g of carbohydrate per hour is a sensible starting range. Longer races and harder efforts may require 60–90g per hour, while athletes who have trained their gut and use multiple transportable carbohydrates may tolerate more. The right number depends on body size, event duration, intensity, pre-race fuelling and individual tolerance.

This is where gels are often easier to execute. If each packet contains a known carbohydrate dose, you can build a simple schedule: take one at set intervals and adjust around drink carbohydrate. With chews, check the serving carefully. One pack may contain several pieces, and each piece may provide only part of the advertised serving. Eating two pieces when you meant to eat a full serving can leave you well behind your hourly target.

That does not make chews inferior. It makes precision more important. If you use chews, decide in advance how many pieces equal one intake point and when those intake points happen.

What changes when the pace rises

A relaxed long run gives you time to unwrap, chew and drink. The final third of a marathon does not. As fatigue builds, small tasks become harder: opening packets with cold fingers, remembering the last time you ate, chewing through a dry mouth or finding water at a crowded aid station.

Gels reduce that decision load. Open, take, drink, continue. For athletes racing on feel rather than chasing bottles and packets, that simplicity can be decisive. It is one reason gels are so common in competitive running.

Chews have a different advantage. They allow you to drip-feed carbohydrate between aid stations. Rather than taking 25g at once, you might take a piece every 10–15 minutes. Some runners find this steadier approach more comfortable, particularly early in an event when they do not yet need to force intake.

However, do not confuse smaller bites with a lower gut burden. The total carbohydrate, the concentration of your drink, your fluid intake and the effort level still determine how your stomach responds. A runner who nibbles chews all race but drinks too little can still run into trouble.

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Gut comfort is a protocol problem

When athletes say gels do not agree with them, the gel itself is not always the issue. Common causes include taking a concentrated product without sufficient fluid, consuming too much too soon, trying a new flavour on race day, combining several carbohydrate sources without doing the maths, or asking an untrained gut to handle race-level intake.

Chews can create their own problems. They may stick to teeth, feel overly sweet or become hard to eat in cool conditions. Some runners also chew less effectively when breathing hard, then wash down a half-chewed mouthful with little water. That is not a reliable fuelling strategy.

Start by practising your exact plan in training. Use the same products, timing, bottles and anticipated carbohydrate rate you intend to use in your target race. Begin at a manageable intake and build across several long runs. Your gut adapts to regular carbohydrate intake just as your legs adapt to training load.

Pay attention to the full system. Carbohydrate is only one part of execution. Fluid needs change with temperature, humidity, sweat rate and pace. Sodium requirements also vary substantially between athletes. A runner losing heavy sweat in warm conditions may need a more deliberate electrolyte plan than someone racing a cool spring half marathon.

Match the format to the session

For an easy run of less than an hour, you may not need either gels or chews, provided you started adequately fuelled. Carrying nutrition can still make sense if conditions are hot, the route is remote or the session may run long, but it is not a compulsory ritual.

For a steady long run, chews can work well if you enjoy taking small, regular amounts and can keep track of your intake. They are also useful for runners who want a break from liquid-style textures. Take them before you are hungry or flat. Waiting for a dip in energy usually means you are already reacting rather than executing.

For threshold work, long intervals or a race-specific progression run, gels often have the edge. You can take a defined dose quickly during an easier segment without prolonged chewing. The same applies to a marathon or half Ironman, where the cumulative cost of small distractions is real.

For a half marathon, the decision depends on finish time and breakfast. A runner racing for 90 minutes may need only one planned carbohydrate intake, while a runner out for two hours or more will benefit from a more structured approach. For a marathon, plan for repeated intake from early in the race. Do not wait until mile 18 to discover which format you can tolerate.

Build your fuel plan around numbers, not preference alone

A favourite flavour has value, but it is not a race strategy. Set a carbohydrate target per hour, count what comes from gels or chews, then include any carbohydrate in your drink. Next, decide where fluid will come from: your own bottles, aid stations or both.

For example, a runner targeting 60g per hour might use two 30g gels, or a measured number of chews plus carbohydrate drink. The format can change, but the total must still add up. If you are carrying gels and relying on course water, identify the aid stations where you will drink. If you are using chews, pre-sort servings so there is no arithmetic required while fatigued.

This is the logic behind a system rather than a collection of products. truefuels approaches fuelling through planned carbohydrate and electrolyte delivery, so athletes can prepare for the actual demands of the session instead of making decisions at the point of fatigue.

A practical race-day decision

Choose gels if you want the quickest route to a known carbohydrate dose, especially during hard running or races with regular water stations. Choose chews if smaller, more frequent intakes improve your comfort and you can manage the packaging, timing and fluid around them.

You can also use both. Many runners rely on gels as the foundation of their plan, then carry chews for variety or use them in the early stages when effort is controlled. The only rule is that every part of the plan must be tested before race day.

The best fuel is not the one that looks smartest in your pocket. It is the one you can take on schedule, absorb comfortably and repeat when the race asks the most of you.

40g. One format. No decisions when the race gets hard.

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★ 4.86 — 200+ reviews Built by Alistair Brownlee, Two-time Olympic Triathlon Champion