Understanding Calorie Burn at Altitude
Mountaineering is one of the most calorically demanding activities available. A full day of technical climbing can burn 4,000-6,000+ calories — roughly twice what a typical person consumes. At altitude, this demand increases further as the body works harder for every step.
💡 Why Burn Increases at Altitude
Above 3,000m, your basal metabolic rate increases by 7-10% per 1,000m of elevation. Combined with increased breathing effort, labored movement on technical terrain, and heavy packs, your calorie requirements can double compared to equivalent activity at sea level.
Base Calorie Rates by Activity
- Light hiking: 300-400 cal/hr
- Moderate hiking: 400-600 cal/hr
- Heavy pack trekking: 500-700 cal/hr
- Scrambling: 600-800 cal/hr
- Technical mountaineering: 700-900 cal/hr
- Ice climbing: 800-1200 cal/hr
Feeding for High Altitude
- Prioritize high-density carbohydrates (60-65% of calories) for quick energy
- Fat and protein become important for longer expeditions but digest slower
- At extreme altitude, appetite drops dramatically — focus on calorie-dense foods
- Warm food and drinks help maintain core temperature and morale