Nutrition Fundamentals for Runners

Runners burn 80-120 calories per kilometer depending on body weight, pace, and terrain. A 60-minute training run can burn 600-900 calories — and that's on top of your baseline metabolic needs. This creates unique nutritional demands that a generic "eat healthy" approach doesn't address. Underfueling is surprisingly common among recreational runners. The symptoms are subtle at first: sluggish easy runs, poor sleep, lingering soreness, stalled progress. Over time, chronic underfueling leads to Relative Energy Deficiency in Sport (RED-S), which affects hormones, bone density, immune function, and performance. The goal isn't to obsess over calories. It's to understand the building blocks your body needs and ensure you're providing them consistently.

Every runner's diet rests on three pillars: **Carbohydrates — Your Primary Fuel** Carbs are the dominant energy source for running, especially at moderate-to-hard intensities. Your muscles store carbohydrates as glycogen, and a trained runner can store roughly 90-120 minutes worth. After that, you "bonk." - Aim for 5-7g of carbs per kilogram of body weight on moderate training days - On heavy training days or long runs, increase to 7-10g/kg - Good sources: rice, oats, pasta, potatoes, bread, fruit, sweet potatoes **Protein — Repair and Adaptation** Running damages muscle fibers (this is how you get stronger). Protein provides the amino acids to rebuild them. Runners need more protein than sedentary people but less than bodybuilders. - Target 1.4-1.8g of protein per kilogram of body weight daily - Spread intake across meals — your body can only absorb ~30-40g per sitting - Good sources: eggs, chicken, fish, Greek yogurt, lentils, tofu, whey protein **Fat — The Slow Burn** Fat is your fuel source for low-intensity running (Zone 1-2). It also supports hormone production, brain function, and absorption of fat-soluble vitamins. - Aim for 1.0-1.5g of fat per kilogram of body weight - Prioritize unsaturated fats: olive oil, avocados, nuts, fatty fish - Don't fear fat — low-fat diets often lead to hormonal disruption in runners

When you eat matters almost as much as what you eat, especially around harder workouts: **Before a run (2-3 hours)**: A balanced meal with carbs, moderate protein, and low fat. Example: oatmeal with banana and a drizzle of honey, or toast with eggs. **Before a run (30-60 minutes)**: If you need a top-up, keep it simple and carb-focused. A banana, a handful of dates, or a small energy bar. Avoid fiber and fat — they slow digestion and can cause GI distress. **After a run (within 30-60 minutes)**: The "recovery window" is real but not as narrow as old science suggested. Aim for a 3:1 or 4:1 carb-to-protein ratio to replenish glycogen and kickstart muscle repair. Chocolate milk is famously effective. A smoothie with fruit, protein powder, and milk works too. **For easy runs under 60 minutes**: You don't need to eat beforehand if you've had a normal meal in the past 3-4 hours. Fasted easy runs can actually improve fat oxidation — but never do hard workouts fasted.

Dehydration of just 2% of body weight can reduce performance by 10-20%. But overhydration (hyponatremia) is dangerous too. The key is matching intake to sweat rate. **Daily hydration**: A simple rule — drink enough that your urine is pale yellow, not clear (overhydrated) or dark yellow (dehydrated). For most runners, this means 2-3 liters per day plus what you sweat during training. **During runs under 60 minutes**: Water before and after is usually sufficient. You won't dehydrate significantly in an hour. **During runs over 60 minutes**: Sip 150-250ml every 15-20 minutes. In hot conditions or for runs over 90 minutes, add electrolytes — sodium is the critical one, as you lose 500-1500mg per liter of sweat. **Sweat rate test**: Weigh yourself before and after a 1-hour run (no drinking during). Every kilogram lost equals roughly 1 liter of sweat. This tells you exactly how much you need to replace.

Your nutritional needs shift as your training plan progresses through its phases: **Foundation Phase**: Moderate carb intake. Focus on establishing consistent eating habits that match your training rhythm. This is a good time to experiment with pre-run meals and find what works for your stomach. **Build Phase**: Increase carb intake as volume rises. Your long runs are getting longer, and glycogen demands are higher. Pay extra attention to post-run recovery nutrition — you're asking a lot of your body. **Peak Phase**: Intensity is high but volume drops slightly. Prioritize protein for muscle repair and quality carbs for glycogen replenishment between hard sessions. Sleep and nutrition are your two biggest recovery tools. **Taper Phase**: Reduce portion sizes as training volume drops — but maintain carb ratios. In the final 2-3 days before a race, slightly increase carb intake to top off glycogen stores. This isn't "carbo-loading" in the old pasta-binge sense — it's strategic fueling. Coach Steeev's training plans account for training phase intensity. Aligning your nutrition with these phases is the often-overlooked piece that ties everything together.