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Beyond 26.2First 50K field guide

First 50K field note

50K Fueling and Hydration Plan

Turn products, grams, water, aid stations, weather, and carrying into one rehearsed system.

Plain answerBuild a time-based carbohydrate and fluid plan, then map it to aid stations and what you can carry. Practice the exact foods, concentration, timing, water pairing, and container system in similar duration and conditions. Start before hunger or thirst becomes a crisis.

Set a trained carbohydrate range

Sports-nutrition guidance commonly uses 30–60 grams of carbohydrate per hour for prolonged exercise. Some efforts beyond 2.5 hours may benefit from up to 90 grams per hour using multiple carbohydrate sources, but only when the gut has been trained and the amount is tolerated.

Source checkCarbohydrates for training and competition
This peer-reviewed review describes 30–60 g/h for longer exercise and potential benefit up to 90 g/h beyond 2.5 hours with trained use of multiple transportable carbohydrates.

Map the system

  1. Estimate realistic duration between aid stations.
  2. Choose food and drink you can carry and consume.
  3. Count carbohydrate from gels, chews, food, and drink together.
  4. Practice with the exact water pairing and conditions.
  5. Carry contingency without inventing a second untested plan.
Source checkACSM Exercise and Fluid Replacement position stand
Fluid replacement should be individualized because sweat rate and sweat-electrolyte content vary widely. The goal is to limit excessive dehydration without overdrinking.

Avoid both fluid errors

Underdrinking can impair performance and raise strain; drinking beyond losses can create dangerous hyponatremia. Weather, pace, altitude, sweat rate, acclimatization, and aid access change needs. Medical conditions or medication warrant qualified individual guidance.

Field ruleA plan that cannot fit between two aid stations is not a plan. Reconcile grams, fluid volume, carrying capacity, and time.

Give the ordinary weeks a reason

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