By Ethan BrooksUpdated November 2026
If you are choosing between energy bars, chews or gels for long efforts, the short answer is this: gels win for fast, reliable carbohydrate delivery during hard running or racing, chews suit runners who want something they can chew slowly and space out, and bars work best as a pre-run or between-workout snack rather than something you eat while moving. The right choice depends on how your stomach tolerates solid food, how much you sweat, and how often you need to top up fuel during a session.
Bottom Line at a Glance
Most runners asking about energy bars, chews or gels are planning fueling for a marathon, half marathon, or long training run. Gels are the default for race-pace efforts. Chews are a middle ground that many runners find easier on the mouth and stomach. Bars belong in your routine, but mostly away from the moment you need to keep moving.
| Criteria | Energy Bars | Energy Chews | Energy Gels |
|---|---|---|---|
| Format | Solid, compact block | Soft, chewable pieces | Thick liquid in a packet |
| Carbohydrates per serving (typical) | Often 20–40 g | Often 20–25 g per serving | Often 20–25 g per packet |
| Ease of eating while running | Poor | Moderate | Excellent |
| Water needed to consume | Usually yes | Usually small amount | Yes, typically 4–8 oz |
| Digestion speed | Slowest | Moderate | Fastest |
| Best timing | Before or after training | During long efforts, spaced out | During race pace or hard sessions |
| Portability and packaging | Good, but bulky in pockets | Good, resealable options common | Very compact, tear-open packets |
| Stomach tolerance for most runners | Good when eaten at rest | Generally gentle | Can upset some runners at high intake |
Carbohydrate Delivery: Which Option Works Fastest?
Winner: Energy gels.
Gels are designed to be liquid or near-liquid, which means the carbohydrate reaches your small intestine quickly. Sports nutrition guidance generally recommends roughly 30–60 grams of carbohydrate per hour for efforts lasting more than about 60–75 minutes, and higher intakes (up to around 90 grams per hour) for some well-trained athletes using a mix of glucose and fructose. Gels make hitting those numbers simple because each packet carries a predictable dose.
Chews deliver carbohydrate at a slower rate because you have to chew and swallow them, but they still absorb reasonably well when taken with water. Bars are the slowest, since they must be chewed thoroughly and digested as solid food.
Ease of Use While Moving
Winner: Energy gels.
Opening a gel, squeezing it into your mouth and swallowing takes a second or two at a steady pace. A runner can do this without slowing down much. Chews take longer because you need to put several pieces in your mouth and chew them while breathing hard. Bars are awkward to manage at speed; crumbs and dry texture make them a poor choice unless you stop or slow to a walk.
If you run in a crowded race, a gel is also simpler to manage with a gloved or sweaty hand, since the packet is easy to tear and empty in a single motion.
Digestion and Stomach Comfort
Winner: Energy chews for most runners who struggle with gels.
Gels are concentrated, and many runners experience stomach discomfort, cramping or nausea when they take them with little water or at high frequency. This is a common complaint, though individual tolerance varies widely. Chews spread the same carbohydrate across several pieces and tend to feel gentler because the sugar arrives in smaller amounts over a longer period. Many runners report fewer digestive issues with chews, particularly in the heat.
Bars are the easiest to digest when eaten well before a run, as they contain fat, protein and fiber that slow gastric emptying. That same slowness makes them a poor choice during a race.
If you have a history of gastrointestinal problems, a sports dietitian or your physician can help you test fueling options safely before race day.
Taste, Texture and Flavor Variety
Winner: Energy chews for texture variety; energy bars for flavor and satiety.
Chews come in fruity, candy-like flavors that many runners find pleasant over long periods. Gels range from light fruit flavors to more intense or caffeinated options, and some runners find the thick, syrupy texture hard to tolerate after an hour of running. Bars offer the most savory and dessert-style options, including nut-based and chocolate varieties, which can be welcome during a long training day when you want something more filling.
Portability and Packaging
Winner: Energy gels for race belts; energy chews for resealable convenience.
Gels are flat and light, so they fit neatly in a race belt, shorts pocket or handheld holder. Chews often come in small resealable pouches, which helps if you need to store a partially eaten pack. Bars are bulkier and can crumble in a pocket, so they usually need a zippered compartment in a running vest or hydration pack.
Practical Fueling Plans
A simple plan many runners use for a marathon looks like this:
- Eat a bar two to three hours before the start, as part of a normal breakfast or pre-race meal.
- Begin using gels or chews about 30–45 minutes into the run, then every 30–45 minutes after that.
- Take each gel or chew serving with 4–6 oz of water (or whatever your race course provides).
- Practice this exact plan on at least two or three long runs before race day.
For more detail on timing, see When to Take Energy Gels: A Marathoner's Timing Guide and When to Take Energy Gels Running: Timing, Dosage and Race-Day Tips.
Cost-Effective Choices and Budget Options
Winner: Energy bars for bulk value; energy chews for balanced cost per serving.
Bars usually come in multi-packs and can be cheaper per gram of carbohydrate when bought in bulk, though a bar also provides more food than you may need mid-run. Gels are often sold in boxes and are a reliable choice for race-day stocking. Chews sit in the middle. Focus on how many grams of carbohydrate you get per serving rather than the package size.
Which Should You Choose?
- Choose energy gels if you run marathons or half marathons at race pace, want the fastest carbohydrate delivery, and do not mind taking them with water.
- Choose energy chews if gels upset your stomach, you prefer something you can chew slowly, or you want more flavor variety on long training runs.
- Choose energy bars for pre-run meals, post-run recovery or long days out where you can stop to eat, but do not rely on them as your main in-motion fuel.
- Combine options if you run ultra-distance events. Many runners use gels for race pace and bars for slower stretches or meals.
Top Options to Consider
Gels: Many runners start with the widely available GU Energy Gel, a standard option in running stores and race expos. For a fruit-forward alternative, the Clif Shot Energy Gel is a common choice. View on Amazon
Chews: The GU Energy Chews are a popular option for runners who want chewable fuel. View on Amazon The Clif Shot Bloks are another common choice. View on Amazon
Bars: The Clif Bar is a widely recognized energy bar used for pre-run and between-workout fueling. View on Amazon For a more compact, carbohydrate-focused option, the Honey Stinger Organic Energy Bar is often cited by runners. View on Amazon
If you want a broader look at gel options, see Top 6 Marathon Running Energy Gels for Race Day Fueling and Top 6 Energy Gels for Runners Compared in 2026. For a direct comparison of chews and gels for running, read Energy Chews vs Gels for Running (2026): Which Is Better for Long Runs?.
FAQ
Are energy chews as effective as gels for marathon fueling?
Chews can provide the same total carbohydrate as gels, but they absorb a little more slowly because they must be chewed and swallowed. Many runners use chews successfully for the marathon, especially in the early and middle stages. Test both during training to see which your stomach handles better at race pace.
Can I eat an energy bar during a marathon?
You can, but it is awkward at race pace and bars digest slowly. Most runners save bars for before the start or for slower segments such as aid station walks. If you do eat one mid-race, practice it first on a long run.
How much water should I drink with a gel?
A common guideline is 4–6 oz of water per gel, though needs vary with heat, sweat rate and body size. Taking a gel without water can increase stomach discomfort for many people. Check the manufacturer’s instructions and adjust based on your own training experience.
Do gels or chews cause stomach problems?
Some runners experience cramping, nausea or diarrhea with gels, especially at high intake or in hot conditions. Chews are often gentler for these runners. Stomach issues are highly individual, so test your fueling plan during training. If you have ongoing digestive symptoms, consult a physician or sports dietitian.
How many carbs per hour should I aim for?
For efforts longer than about 60–75 minutes, many sports nutrition sources suggest 30–60 grams of carbohydrate per hour. Well-trained athletes sometimes aim higher using multiple carbohydrate types. Use a product label to count grams per serving, then build a schedule you can repeat on training days.
Conclusion
For most marathon and half marathon runners, energy gels are the most practical in-motion fuel because they deliver carbohydrate quickly and fit easily into a race plan. Energy chews are a strong alternative for runners whose stomachs struggle with gels, and they offer a pleasant chewing experience over long hours. Energy bars have a clear role before and after training, though they are rarely the best choice while you are running hard. Try each option on your long runs, note how you feel at 60, 90 and 120 minutes, and settle on the one that keeps your energy steady and your stomach calm on race day. Consult a sports dietitian or physician if you have digestive concerns or medical conditions that affect your fueling needs.
About Ethan Brooks
Ethan Brooks is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.
