What you eat in the 24 hours before a high-altitude trek matters more than most travelers realize. The body’s ability to perform at 5,000 meters is already compromised by reduced oxygen, and the wrong food choices add unnecessary burden. Knowing what to eat before trekking in Peru is one of the simplest ways to give yourself a better day on the mountain.
Why Nutrition at Altitude Is Different
At high altitude, your body works harder than usual just to maintain normal function. Oxygen availability is reduced, your heart rate is elevated, and your digestive system is under stress. As NIH research on carbohydrates and high altitude performance confirms, people planning physical activity at high altitude should prioritize carbohydrate intake while still at sea level. The meal before your Rainbow Mountain day trip from Cusco is part of your preparation.
What to Eat the Night Before
The evening before your trek is when carbohydrate loading pays off. Fill your glycogen stores with something that digests easily and sits well overnight. Good choices include:
- Pasta or ricewith a light protein source like chicken or eggs
- Quinoa— high in protein, rich in complex carbohydrates, and a Cusco staple
- Bread with soup— warm, easy to digest, available everywhere in Cusco
- Potatoes— an Andean staple with high carbohydrate content
Heavy, fatty meals are worth skipping the night before. Fat takes longer to digest, sits heavier at altitude, and provides less efficient fuel than carbohydrates for aerobic effort. Alcohol is off the table entirely — it dehydrates you, disrupts sleep quality, and makes altitude symptoms noticeably worse.
The Morning of the Trek
Your rainbow mountain Cusco tour picks you up before dawn. Most tours include a breakfast stop, but having something in your system before you leave matters. Keep it light and carbohydrate-forward:
- A banana or two — easily digestible, rich in potassium, quick energy
- Plain crackers or bread with peanut butter
- Oats, if you can manage them — slow-release energy through the ascent
- Avoid coffee on an empty stomach — it worsens altitude headaches
What to Bring on the Trail
Appetite drops at altitude during your Rainbow Mountain Peru day tour, so bring snacks you want to eat. Energy bars, dried fruit, nuts, and chocolate — light, calorie-dense, easy to carry.
Water is the most critical thing in your pack. Dehydration accelerates every altitude symptom, and the dry mountain air means you’re losing more fluid than you realize. Aim for two liters and drink consistently rather than waiting until thirsty.
Coca Leaves: The Andean Tradition Worth Knowing
No nutrition guide for trekking in Peru is complete without mentioning coca leaves. As Britannica notes on coca and Andean culture, coca leaves have been chewed by indigenous Andean peoples for centuries to withstand strenuous conditions, hunger, and fatigue at high altitude. Coca tea and coca candy are widely available in Cusco and on most guided tours, and many travelers find them helpful for mild altitude symptoms on the trail.
What to Avoid
In the 24 hours before your trek, avoid:
- Alcohol— dehydrates and worsens altitude symptoms
- Heavy fatty meals— slow to digest and inefficient fuel
- Spicy food— digestive discomfort compounds badly at altitude
- Large portions— moderate, consistent amounts work better
- Too much coffee— excess caffeine dehydrates and worsens headaches
Get Ready for Rainbow Mountain With Rainbow Mountain Expeditions
Knowing what to eat before trekking in Peru is one piece of the preparation puzzle. At Rainbow Mountain Expeditions, every traveler gets guidance on nutrition, hydration, and acclimatization before stepping on the trail. Whether booking a rainbow mountain day trip from Cusco or an exclusive trek to Wilcacunca, our guides are with you every step. Contact us and let’s get you ready for the mountain.