Fueling long rides with real food vs gels
Long rides are won or lost in the gut. Choose fuel that your stomach accepts, your legs can use, and your brain can manage when the pace bites. Here’s a clear comparison of real food and gels, with practical targets for absorption, gut tolerance, and stable energy.
What actually fuels your watts: absorption and oxidation
To convert bites into watts, carbs must leave the stomach, cross the intestine, reach the blood, and be oxidized by your muscles. The key bottlenecks:
- Gastric emptying: typically up to ~1.0–1.2 L/hour, slower at higher intensities (near threshold and above) and with hypertonic drinks/gels.
- Carb absorption: a single glucose pathway (SGLT1) saturates around ~60 g/hour. Adding fructose (GLUT5) increases capacity to ~90 g/hour and, with gut training, up to ~100–120 g/hour.
- Exogenous carb oxidation: roughly mirrors absorption—~60 g/hour for glucose alone; ~90 g/hour (and up to ~110–120 g/hour when well-trained) for glucose+fructose mixes.
| Factor | Gels | Real food (ride-friendly examples) |
|---|---|---|
| Absorption speed | Fast, especially glucose/maltodextrin+fructose blends. Must take with water to avoid slowing stomach emptying. | Moderate. Starchy, low-fiber items (rice cakes, white bread + jam, boiled potatoes, ripe bananas, fig bars, dates) empty well; higher fat/fiber slows. |
| Osmolality | Often hypertonic alone; co-ingest ~200–300 ml water per gel to achieve ~6–8% solution. | Typically isotonic or hypotonic if moist; less risk of drawing water into the gut. |
| Energy stability | Sharp glucose rise—great during hard efforts; can cause peaks/dips if pacing eases or hydration lags. | Flatter curve from starch and some fiber; steadier feel during Z2-Z3; may feel “heavy” at high intensity if too fibrous or fatty. |
| Gut tolerance at high intensity | Good if diluted; poor if stacked without fluid. | Good if low-fiber/low-fat; poor with nuts, high fiber, or big bites late in hard efforts. |
| Convenience | Max convenience; easy to time around intervals. | Cheaper; can be messy; portioning matters. |
When to choose real food vs gels
- Endurance pace (Z2, ~60–75% FTP): favor real food for satiety and stable energy; add some drink mix. Example: rice cake + banana + sports drink.
- Tempo to threshold (Z3–Z4, sweet spot/FTP): lean toward faster carbs. Use gels/chews before and during efforts; keep real food simple (white bread + honey).
- Racing or surges (Z4–Z5): prioritize gels/chews and 6–8% drink mix for rapid delivery. Real food is risky right before attacks.
- Cold days: real food is easier to tolerate; still drink—thirst is blunted.
- Hot days: prioritize fluids/electrolytes; use gels only with sufficient water; minimize dry, chewy foods.
How much to eat: simple hourly targets
Match carb grams per hour to duration and intensity, then practice.
| Ride duration & intensity | Carbs (g/hour) | Fluid (ml/hour) | Sodium (mg/hour) |
|---|---|---|---|
| 1–2 h (Z2–Z3) | 30–60 | 400–700 (cool) to 600–900 (warm) | 300–600 |
| 2–4 h (Z2–Z3, steady) | 60–90 (glucose+fructose) | 500–900; more if humid | 400–800 |
| 3–6 h (includes tempo/threshold) | 90–120 (gut trained) | 600–1000; aim for pale urine post-ride | 600–1000 |
Gel-with-water rule: take 200–300 ml water per 20–30 g gel to avoid a hypertonic “gut traffic jam.”
Practical menus for long rides
4-hour endurance ride (Z2 at 65–75% FTP, steady 180–220 W)
- Target: ~80 g carbs/hour, 600–800 ml fluid/hour, 500–700 mg sodium/hour.
- Per hour: 1 rice cake with jam (~25 g) + 1 ripe banana (~25 g) + 500 ml 6% drink mix (~30 g) + a pinch of salt or electrolyte tab.
- Add one gel before any long climb to top up quickly.
3-hour workout with 3 x 20 min at threshold (Z4)
- Target: 75–90 g carbs/hour; prioritize fast carbs around intervals.
- 15 min pre-interval: 1 gel (~25 g) + 200–300 ml water.
- During each work block: sip 6–8% drink mix; between sets: half a white-bread honey sandwich (~25–30 g).
Gut tolerance: how to train it
- Progressive load: start at 60 g/hour, add 10–15 g/hour each week until 90–100+ g/hour feels fine.
- Use multiple transportable carbs: glucose/maltodextrin + fructose (roughly 2:1) supports higher rates.
- Practice twice per week in Z2–Z3 rides so race day is familiar.
- Keep fat, fiber, and protein low on the bike. Avoid sugar alcohols and high-FODMAP fruits if you’re sensitive.
- Hydrate to match carbs. Under-drinking with gels is the most common cause of GI distress.
- Test caffeine on training days before using in events (up to ~1–3 mg/kg total across the ride).
Real food ideas that behave like sports fuel
- Rice cakes with jam or syrup (low fiber, easy chew)
- Boiled, salted baby potatoes (dip in salt for sodium)
- White-bread honey or jam sandwich (trim crusts)
- Ripe bananas, dates, or fig bars
- Low-fiber cereal bars with a simple ingredient list
Avoid: nuts, high-fiber wraps, thick nut-butter fillings, raw apples/pears (FODMAPs), and bars with inulin/chicory on hard or hot days.
Common mistakes and quick fixes
- Stacking gels without water: fix by adding 200–300 ml water per gel or switching a gel to drink mix.
- Too much fiber/fat: swap to rice cakes, white bread, or drink mix during hard sections.
- Under-fueling early: start in the first 20–30 minutes; waiting until hungry is too late.
- Single-carb sources only: mix glucose/maltodextrin with fructose to raise your ceiling beyond ~60 g/hour.
- No plan per training zone: use more rapid carbs as intensity nears FTP; real food shines in Z2.
Bottom line: for long, steady miles, real food keeps energy stable and your gut happy; when the pace rises toward FTP, gels and drink mix deliver speed. Train your gut, hit your grams per hour, and your legs—and recovery—will show it.
