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▸ SOP · Scenarios · Bio-Fuel

Bio-Fuel During a Marathon Training Block

68kg runner, 70-mile peak week, 3,200–3,800 kcal/day — the grocery horizon is weekly, not daily.

A 4-week block demands ~100,000 kcal with protein floor. Ramen-only blocks break the runner by week 3.

Subject: 68kg runner, 24 weeks into a 26-week marathon cycle. Peak week: 70 miles running + 2 strength sessions. Daily energy expenditure range: 3,200 kcal (recovery day) to 3,800 kcal (long run day). Block = 4 weeks to race day. Survival efficiency reading: efficiency unset.

▸ Deterministic Formula
daily_need = BMR + (run_kcal × miles) + strength_kcal
weekly_need = Σ(daily_need) across 7 days
protein_floor_g = 1.6 × body_weight_kg
block_total = weekly_need × 4
grocery_horizon = weekly_need, bought Sunday
▸ Logical Gates
  1. Compute daily kcal per training phase (recovery / medium / long).
  2. Sum weekly need. Multiply by 4 for block total.
  3. Protein floor = 1.6 × body_weight_kg. Budget protein sources before carbs.
  4. At efficiency efficiency unset, if low, rebalance toward whole proteins and away from refined carbs.
  5. Grocery horizon weekly — Sunday cart, no mid-week top-ups except produce and dairy.

Quick answer

A 4-week block demands ~100,000 kcal with protein floor. Ramen-only blocks break the runner by week 3.

What you are trying to do
68kg runner, 70-mile peak week, 3,200–3,800 kcal/day — the grocery horizon is weekly, not daily.
Best next step
Bio-Fuel
Limit to remember
Treat this as a practical aid for the task, not a replacement for professional judgment.

▸ Key Specs

  • ▸ Running under-fueled does not make you lighter; it makes you injured.
  • ▸ Total block demand: ~100,000 kcal with 90+ g protein/day floor.
  • ▸ Efficiency reading efficiency unset — if low, the cart is protein-deficient even if kcal targets are hit.
  • ▸ Grocery horizon is weekly. A 25,000 kcal week cannot be bought Sunday without a plan.
  • ▸ "Just ramen and rice" is the injury pipeline. Protein deficit shows up as a calf strain in week 3, not a weight gain.

▸ Worked Examples

  • Weekly kcal + protein target
    Average week: 3,500 kcal/day × 7 = 24,500 kcal/week. Protein floor: 1.6 g/kg × 68 = 109 g/day × 7 = 763 g/week. Equivalent: 2.5 lb chicken breast, 18 eggs, 2 lb Greek yogurt, 1 lb beans, 1 lb peanut butter, plus training-day carb loads.
  • Ramen-only failure mode
    Ramen (3-pack) = 1,140 kcal, 27 g protein, $1.50. Runner eats 4 packs/day = 4,560 kcal, 108 g protein on paper. Protein is low-quality (mostly gluten), sodium 8,000+ mg/day, fiber near zero. Week 2: calf tightness. Week 3: micro-tear during long run. Block abandoned, race missed.
  • 4-week grocery horizon
    Target: 100,000 kcal + 3,000 g protein over 28 days. Weekly spend at mid-range grocery prices: ~$120 (4 lb oats $4, 3 lb rice $3, 24 eggs $6, 2 lb chicken $10, 2 lb ground turkey $10, 2 lb peanut butter $6, 4 lb Greek yogurt $12, 2 lb pasta $3, 2 cans tuna $4, fruits/vegetables $35, bread $5, oil/butter $5, misc $17). Block total: $480. Add $40/wk fueling gels and electrolyte — $640 all-in.

When to use which tool

▸ Operational Thresholds
  • CYAN · STABLE — Weekly kcal hit with protein floor ≥ 1.6 g/kg — training stimulus converts to adaptation.
  • GOLD · GUARDED — Kcal hit but protein 1.2–1.6 g/kg — monitor for soreness lingering past 48 hours.
  • MAGENTA · CRITICAL — Protein below 1.2 g/kg or kcal deficit — injury risk rising weekly; pause mileage build.
▸ READ NEXT
Calorie-per-Dollar →
Cart cost running high — rank per-item kcal/$ to swap expensive low-yield items.

Related

Frequently asked questions

› Do I need gels and sports drinks?

On runs over 90 minutes, yes — 30–60 g carb/hour. Under 90 minutes, water and a pre-run meal are sufficient. Gels are about GI tolerance as much as energy; practice in training, not race day.

› Is 1.6 g/kg protein enough? Trust & accuracy

For recovery, yes. For simultaneous strength gains, push to 1.8–2.0 g/kg. Runners recovering from injury can hold at 1.4 g/kg without loss. Never below 1.2 g/kg during a block.

› How should I use this guide with a Kefiw tool? How-to

Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.

› What mistake do tool guides help avoid? Troubleshooting

Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.

› Can a tool guide help me learn the skill? How-to

A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.