Eating for Altitude Performance
At altitude, your body faces a paradoxical challenge: you need more calories because exertion is harder, yet appetite decreases and digestion slows. Studies show energy expenditure at 5,000m can exceed 5,000 kcal/day during hard climbing — nearly double what most people consume.
Why Carbs Are Critical
Carbohydrates are the primary fuel for high-intensity muscular work, and they're the only fuel that can be metabolized without oxygen. At altitude, fat metabolism is impaired, making carbs even more important. Aim for 55-65% of calories from carbohydrates — significantly higher than the typical 45-55% for non-athletes.
Food Selection for the Mountains
- Breakfast: Oatmeal with nuts and dried fruit, energy bars, instant oatmeal packets
- On the move: Trail mix, energy gels, jerky, cheese, crackers, nut butter packets
- At camp: Instant rice/pasta dishes, dried soups, freeze-dried meals, hot chocolate
- Emergency: Hard candies, glucose tablets, chocolate bars (also serve as emergency fuel)
💡 Practical RulePlan to eat 200-300 kcal per hour during active climbing. In cold conditions, warm food in the evening dramatically improves morale and helps with recovery — even if the caloric difference is marginal.