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Nutrition

Runner's Nutrition: Before, During & After (5K, Half & Marathon)

What to eat and drink at every distance — from your first 5K to 26.2 miles. Practical fueling without the overwhelm.

By B10 min read
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You don't need a perfect diet to start running. But what you eat — and when — affects how runs feel and how fast you recover. Here's a distance-by-distance guide for everyday runners, not elite athletes.

Daily basics (all distances)

  • ·Eat enough — under-fueling leads to fatigue and injury
  • ·Include carbs, protein, and healthy fats at most meals
  • ·Hydrate throughout the day, not just before runs
  • ·Limit heavy alcohol before hard training days

5K fueling

Before (1–3 hours prior)

  • ·Light, familiar meal: toast with peanut butter, oatmeal, or a banana
  • ·Avoid high-fiber or greasy foods that upset your stomach
  • ·A small snack 30–60 min before is fine if you're hungry: half a banana or a few crackers

During

  • ·Water is enough for most 5Ks under 40 minutes
  • ·Hot weather? Sip water if available on course
  • ·No gels needed at this distance for beginners

After

  • ·Eat within 1–2 hours: protein + carbs (eggs on toast, yogurt with fruit, rice and chicken)
  • ·Rehydrate with water; sports drinks optional if you sweated heavily

Half marathon fueling

Before

  • ·Night before: normal dinner, slightly carb-forward (pasta, rice, potatoes) — don't overeat
  • ·Race morning (2–3 hrs before): oatmeal, bagel, or toast — tested in training
  • ·Race morning (30–60 min before): small top-up if needed — gel or banana

During

  • ·Water at most aid stations — sip, don't chug
  • ·Consider 1 gel or chews around mile 6–8 if running 2+ hours
  • ·Practice this on long runs — never try new fuel on race day

After

  • ·Recovery snack within 30 min: chocolate milk, protein shake, or banana + nut butter
  • ·Full meal within 2 hours with carbs and protein
  • ·Replace fluids gradually over several hours

Full marathon fueling

Before

  • ·2–3 days out: steady eating, don't carb-load excessively the night before
  • ·Race morning: same breakfast you've practiced on long run days
  • ·Coffee is fine if it's part of your routine — skip new caffeine experiments

During

  • ·30–60g carbs per hour after the first 45–60 minutes (gels, chews, sports drink)
  • ·Set a timer — fuel before you feel hungry
  • ·Alternate water and electrolyte drink at aid stations
  • ·Know what's on the course and practice with those brands if possible

After

  • ·Walk, stretch lightly, eat something within 30–60 minutes
  • ·Prioritize carbs + protein for 24–48 hours — your muscles are hungry
  • ·Electrolytes and salty foods help if you cramp or sweat heavily
  • ·Celebrate with food — you've earned it

Common mistakes

  • ·Trying new foods or gels on race day
  • ·Skipping breakfast because nerves kill appetite
  • ·Drinking only water in hot marathons (hyponatremia risk)
  • ·Eating too much the night before and sleeping poorly

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