Nutrition and Hydration for the Bogotá Half Marathon: What You Need to Know Before Race Day

Bogotá sits at approximately 2,640 meters (8,660 feet) above sea level. If you're flying in from sea level — Miami, New York, Medellín, Lima — your body is already working harder before you lace up your shoes. Altitude increases your respiratory rate, accelerates fluid loss through breathing, reduces your plasma volume, and stresses your cardiovascular system in ways that demand a completely recalibrated nutrition and hydration strategy.

I've coached athletes who ran Bogotá well-prepared and athletes who showed up with the same plan they used at a flat sea-level race. The difference in outcome was stark. This post is the complete guide I give my athletes before this race — covering the week before, the day before, race morning, on-course fueling by finish time, and post-race recovery.

Let's get into it.

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Why Altitude Changes Everything About Your Fluid and Fuel Needs

Before we build your plan, you need to understand the physiology at play — because the strategy follows from the science.

Sweat Rate and Fluid Loss at Altitude

At altitude, you lose fluid through three simultaneous pathways that don't all happen at the same rate at sea level:

1. Sweat. Your sweat rate at altitude is typically 10–15% lower than at sea level in hot conditions, because Bogotá's climate is cool (average race-day temperature: 8–14°C / 46–57°F). Don't be fooled. Lower temperature does not mean lower fluid loss.

2. Respiratory fluid loss. This is the hidden killer at altitude. Dry, thin air at 2,640m means every breath you exhale carries significantly more water vapor than at sea level. At rest, respiratory water loss at altitude can reach 1.5–2x sea-level values. During sustained running effort, this climbs dramatically.

3. Increased urine output. In the first 24–72 hours of altitude exposure, your kidneys increase urine output as part of the acclimatization response. This accelerates dehydration if you're not actively compensating.

Estimated fluid loss per hour at race effort in Bogotá:

Finish Time	Pace (min/km)	Estimated Sweat Rate	Respiratory Loss	Total Estimated Loss/hr
Under 1:30	< 4:16	600–800 mL	150–200 mL	750–1,000 mL/hr
1:30–1:45	4:16–4:58	500–700 mL	130–180 mL	630–880 mL/hr
1:45–2:00	4:58–5:41	450–600 mL	120–160 mL	570–760 mL/hr
2:00–2:15	5:41–6:24	400–550 mL	110–150 mL	510–700 mL/hr
2:15–2:30	6:24–7:07	350–500 mL	100–140 mL	450–640 mL/hr

These are estimates based on cool-weather running physiology and altitude respiratory data. Individual sweat rates vary significantly. The best data point is your own sweat test (more on that below).

Your personal sweat rate test: Weigh yourself naked before and after a 60-minute run at race effort. Every kilogram lost equals approximately 1 liter of fluid deficit (accounting for fluid consumed during the run). Do this during a training run in similar conditions — ideally at altitude if possible, or in a cool environment if not.

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The Week Before Race Day: Nutritional Foundation

Days 7–4 Before the Race: Normal Eating with Altitude Awareness

If you're traveling to Bogotá more than 4 days before race day, you have time for partial acclimatization. Use it.

• Prioritize iron-rich foods. Altitude stimulates erythropoietin (EPO) production, which drives red blood cell synthesis. Feed that process: lean red meat, lentils, spinach, fortified cereals. Pair iron sources with vitamin C to maximize absorption.
• Increase baseline hydration. Add 500–750 mL of water per day above your normal intake from the moment you arrive. Your kidneys are working overtime.
• Limit alcohol completely. Alcohol is a diuretic, disrupts sleep quality at altitude (already compromised), and impairs glycogen synthesis. Not negotiable race week.
• Sodium intake matters. With increased urinary output at altitude, electrolyte losses accelerate. Don't go low-sodium the week before a major race.
• Carbohydrate baseline. Aim for 5–7 g of carbohydrate per kg of body weight daily during days 7–4. This is your glycogen maintenance phase, not yet your loading phase.

Days 3–2 Before the Race: Carbohydrate Loading Window

For a half marathon, traditional 3-day carbohydrate loading isn't necessary the way it is for a marathon. However, topping off glycogen stores 2–3 days out is absolutely evidence-based practice.

• Target: 8–10 g of carbohydrate per kg of body weight per day for 2 days.
• For a 70 kg runner: That's 560–700 g of carbs daily. This sounds like a lot because it is. Spread it across 5–6 eating occasions.
• Choose easily digestible carbohydrates: white rice, pasta, bread, potatoes, bananas, sports drinks. Now is not the time for high-fiber legumes or cruciferous vegetables.
• Reduce fiber intake starting 2 days out to minimize GI distress on race morning.
• Protein and fat: Maintain protein at 1.6–1.8 g/kg/day. Reduce dietary fat slightly — not because fat is bad, but because it displaces carbohydrate calories in these 2 days.
• Hydration: Continue the altitude hydration protocol — 500–750 mL above baseline. Your urine should be pale yellow, not clear (which suggests overhydration) and not dark amber (which signals deficit).

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The Day Before Race Day: The Most Underestimated 24 Hours

Most athletes focus obsessively on race morning and neglect the 24 hours before. This is a mistake. Glycogen storage, hydration status, and sleep quality the night before are the three biggest determinants of how you feel at the gun.

Meals the Day Before

Breakfast (day before): Normal carbohydrate-rich meal. Oatmeal, eggs, toast, fruit. 600–800 calories. Eat foods you know and trust.

Lunch (day before): Your largest meal of the day before race day. This is when you want the bulk of your carbohydrate loading to happen — there's enough time for digestion and glycogen synthesis without creating race-morning GI issues. Pasta or rice with a lean protein source, minimal fat. 700–900 calories.

Afternoon snack: Light carbohydrate snack. Banana, sports bar, crackers with honey. 200–300 calories.

Dinner (night before): Contrary to popular belief, this should be a moderate meal, not a massive pasta feast. You've already loaded glycogen at lunch. A heavy dinner creates a bloated, uncomfortable race morning. Aim for 500–600 calories: familiar carbohydrates, lean protein, minimal fat, minimal fiber. Eat no later than 8:00–8:30 PM to allow adequate digestion time.

Evening hydration: Drink 500 mL of water with electrolytes (sodium + potassium) in the 2 hours before bed. Do not over-drink — you don't want to be up all night urinating. Weigh yourself before bed; this becomes a useful comparison point race morning.

Sleep at Altitude

Altitude disrupts sleep architecture, particularly in the first few nights of exposure. Bogotá's altitude is significant enough that some athletes experience periodic breathing (Cheyne-Stokes respiration) during sleep. This can reduce sleep quality even if total sleep hours look adequate.

Strategies: Keep your room cool, avoid heavy meals late, limit screen exposure after 9 PM, and accept that you may not sleep perfectly the night before the race. Research consistently shows that one night of poor sleep before a race has minimal impact on performance if the preceding nights were adequate. The sleep that matters most is two nights before race day.

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Race Morning: Timing Is Everything

The Bogotá Half Marathon typically starts in the early morning hours. Let's build your protocol around a 6:00 AM or 7:00 AM gun time — adjust the windows if your start time differs.

Pre-Race Breakfast Protocol

3–4 hours before the gun (2:00–3:00 AM or 3:00–4:00 AM): This is your main pre-race meal window. I know — it's early. Set two alarms.

• Target: 1–2 g of carbohydrate per kg of body weight
• For a 70 kg runner: 70–140 g of carbohydrates (280–560 calories from carbs)
• Food: White rice with banana and honey, oatmeal with fruit and a small amount of peanut butter, or toast with jam and a sports drink. Keep fat and fiber low.
• Protein: A small amount (15–20 g) is fine — eggs or Greek yogurt — but don't overdo it.
• Fluid: 400–600 mL of water or sports drink with this meal.
• Why this timing matters: You need 3–4 hours for gastric emptying and blood glucose stabilization. Eating too close to the race elevates insulin at exactly the wrong moment and can cause reactive hypoglycemia in the early miles.

60–90 minutes before the gun:

• Optional: 200–300 mL of sports drink or water. Nothing solid unless you're very comfortable with late eating.
• Caffeine window: If you use caffeine, this is the time. 3–6 mg per kg of body weight is the evidence-based range. For a 70 kg runner: 210–420 mg (roughly 2–3 cups of coffee or a caffeine supplement). Caffeine improves time-trial performance, reduces perceived effort, and is particularly useful at altitude where perceived exertion is already elevated.

30 minutes before the gun:

• 200 mL of water or sports drink, no more.
• Optional: One gel or 30 g of fast-acting carbohydrate if your finish time is over 1:45 and you didn't eat late in the morning.
• Avoid anything new, experimental, or high-fiber.
• Electrolyte consideration: At altitude with cool temperatures, some athletes benefit from a sodium-containing pre-race drink or electrolyte capsule. 300–500 mg of sodium 30 minutes before the start supports fluid retention and early-race plasma volume.

Caffeine: The Altitude Multiplier

Caffeine deserves special attention in the Bogotá context. At altitude, your VO2max is reduced — typically by 1% per 100 meters above 1,500m, meaning you're working at roughly 11–12% below your sea-level aerobic ceiling in Bogotá. Caffeine's ergogenic effect on perceived exertion becomes proportionally more valuable when you're already operating in a physiologically constrained environment.

Important: Caffeine is also a mild diuretic. Offset this by ensuring your pre-race hydration is solid before caffeine ingestion. Do not use caffeine as your primary hydration vehicle.

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On-Course Nutrition and Hydration by Finish Time

Here's where I see the most variation in athlete preparation — and the most preventable race-day disasters. Your on-course strategy should be calibrated to your goal finish time.

Aid Station Planning

The Bogotá Half Marathon typically has aid stations every 2–3 km. Know the course map. Know where water versus sports drink is available. Walk through the plan before you start.

General rule: In cool altitude conditions, your fluid needs are lower than in a hot sea-level race, but your respiratory losses are higher. The net result is that you still need consistent hydration — you just can't rely on thirst alone because altitude suppresses thirst sensation.

By Finish Time Group

Finishing Under 1:30 (Elite/Sub-Elite)

At this pace, GI absorption is compromised by the high intensity of effort. Your fueling window is narrow.

• Pre-race fueling is your primary strategy. You're racing at near-lactate threshold or above for significant portions. Gut blood flow is reduced.
• On course: 150–200 mL per aid station (every 2–3 km). Prioritize electrolyte drink over plain water.
• Gels: 1 gel (30 g carbohydrate) at km 7–8 if you can take it at pace. Some sub-1:30 athletes skip gels entirely and rely on pre-race glycogen loading plus sports drink on course.
• Sodium: 200–300 mg at the halfway mark if you can manage it.
• Total on-course carbohydrate target: 30–45 g
• Total on-course fluid target: 400–600 mL

Finishing 1:30–1:45

• Fueling strategy: 1–2 gels on course.
• Gel 1: km 7 (approximately 30–35 minutes in). Take with 150 mL of water, not sports drink, to control total carbohydrate concentration.
• Gel 2 (optional): km 14–15 if legs feel heavy or pace is slipping.
• Fluid: 150–200 mL at every other aid station, or roughly every 4–5 km. Alternate water and sports drink.
• Sodium: 200–400 mg total on course via gels and sports drink.
• Total on-course carbohydrate target: 45–60 g
• Total on-course fluid target: 500–700 mL

Finishing 1:45–2:00

• Fueling strategy: 2 gels on course.
• Gel 1: km 6–7
• Gel 2: km 13–14
• Fluid: 150–200 mL at most aid stations. At this pace and altitude, you can drink while running or during brief walk-throughs.
• Sodium: 400–500 mg on course. Consider an electrolyte capsule at km 10.
• Total on-course carbohydrate target: 60–75 g
• Total on-course fluid target: 600–800 mL

Finishing 2:00–2:15

• Fueling strategy: 2–3 gels or equivalent real food (dates, banana pieces at aid stations if available).
• Gel 1: km 5–6
• Gel 2: km 12
• Gel 3 (optional): km 18 if you feel glycogen depletion
• Fluid: 200 mL at every aid station. At this effort level, your gut can absorb fluid adequately.
• Sodium: 500–600 mg on course. Electrolyte capsules are your friend here.
• Total on-course carbohydrate target: 75–90 g
• Total on-course fluid target: 700–900 mL

Finishing 2:15–2:30

• Fueling strategy: 3 gels or a combination of gels and real food.
• Gel/food: Every 30–35 minutes on course starting at minute 35–40.
• Timing: Approximately km 6, km 12, km 18
• Fluid: 200–250 mL at every aid station.
• Sodium: 600–700 mg on course. You've been out there long enough that electrolyte balance is a genuine concern, particularly with altitude-driven losses.
• Total on-course carbohydrate target: 90–105 g
• Total on-course fluid target: 800–1,000 mL

The Altitude-Specific Hydration Warning

Do not over-drink at altitude. Hyponatremia — dangerously low blood sodium from excessive water intake — is a real risk in races over 2 hours, particularly when runners drink plain water at every aid station without accounting for sodium intake. At altitude, where thirst is suppressed and athletes may be anxious about dehydration, over-drinking becomes a measurable risk.

The rule: Drink to thirst, not beyond it. Pair fluid intake with sodium. Never drink only plain water for the entirety of a race longer than 75 minutes.

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Post-Race Nutritional Recovery

You crossed the finish line at 8,660 feet. Your body is in a significant state of metabolic stress. What you do in the next 4 hours matters enormously for recovery quality, particularly if you're traveling home within 24–48 hours.

The Recovery Windows

Immediately post-finish (0–15 minutes):

• Fluid: 500–750 mL of electrolyte drink or sports drink. Not plain water alone.
• Sodium: Target 400–600 mg in this window to support fluid retention and plasma volume restoration.
• Simple carbohydrates: Banana, sports drink, or a gel if nothing else is available. Your glycogen resynthesis rate is highest in the first 30 minutes post-exercise.
• Avoid: Alcohol, carbonated drinks, and excessive plain water in this immediate window.

30–60 minutes post-finish:

• Recovery meal or recovery drink: This is your most important nutritional window.
• Target: 1–1.2 g of carbohydrate per kg of body weight + 0.3–0.4 g of protein per kg of body weight.
• For a 70 kg runner: 70–84 g of carbohydrates + 21–28 g of protein.
• Practical options: Chocolate milk (genuinely one of the most evidence-based recovery drinks — it's not marketing), a recovery shake with fruit, rice and chicken, or a well-chosen race-site food option.
• Why protein matters here: Post-endurance exercise muscle protein synthesis is elevated. Leucine-rich protein sources (whey, eggs, dairy) maximize this response. Aim for 2–3 g of leucine in this meal.

2–4 hours post-finish:

• Full meal: Complete, balanced nutrition. Prioritize carbohydrates and lean protein.
• Hydration check: Your urine color is your feedback tool. Pale yellow = on track. Dark = still dehydrated, continue drinking with electrolytes.
• Anti-inflammatory foods: Tart cherry juice, blueberries, fatty fish, and turmeric have supporting evidence for reducing post-exercise inflammation and accelerating recovery markers. If you're a masters runner (45+ like me), this matters more — our baseline inflammatory response to hard exercise is higher and slower to resolve.
• Iron-rich meal: Given the altitude stimulus to red blood cell production, an iron-rich dinner (lean red meat or legumes + vitamin C source) 4–6 hours post-race actively supports the adaptation.

Alcohol post-race: I'll be direct — alcohol impairs glycogen resynthesis, disrupts sleep (already compromised at altitude), impairs muscle protein synthesis, and increases inflammatory markers. If you want to celebrate, wait until the next evening. The recovery cost of day-of drinking at altitude is higher than at sea level.

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A Note on Masters Athletes (45+)

If you're in my age group — 45 to 49, or anywhere in the masters spectrum — a few additional considerations apply specifically to altitude racing and your nutritional strategy.

Masters athletes have reduced thermoregulatory efficiency, slower gastric emptying, reduced plasma volume expansion at altitude, and higher baseline inflammatory responses to intense exercise. This means your hydration needs are, if anything, slightly higher than the estimates above, your recovery nutrition window is less forgiving (you have less time to get nutrients in before recovery quality degrades), and your caffeine sensitivity may be different — test it in training, not on race day.

Also: altitude accentuates the performance gap between well-hydrated and poorly-hydrated athletes. For masters runners competing at or near their age-group limits, showing up to the line in optimal fluid and glycogen status is one of the highest-leverage legal performance advantages available.

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Pre-Race Week Checklist

• Complete your personal sweat rate test at race-effort intensity in cool conditions
• Pack electrolyte capsules, race-day gels (tested in training), and caffeine source
• Increase daily fluid intake by 500–750 mL starting day of arrival in Bogotá
• Execute 2-day carbohydrate loading protocol (days 3–2 before race)
• Reduce fiber from day 2 onward
• Eat your main carbohydrate-loading meal at lunch the day before
• Set alarms for pre-race breakfast (3–4 hours before gun)
• Plan and memorize your on-course fueling schedule matched to your finish time group
• Prepare your post-race recovery drink or meal access in advance
• Know the aid station locations on the race course

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The Bottom Line

Bogotá is a spectacular race in a spectacular city — but it's unforgiving if you treat it like a sea-level event. The altitude demands a proactive hydration strategy (not reactive), a precise fueling plan matched to your actual finish time, a disciplined pre-race eating schedule, and a recovery approach that accounts for the physiological stress of racing at 2,640 meters.

Get the nutrition right, and you'll cross that finish line feeling like you executed your best race. Get it wrong, and you'll spend the back half wondering what happened.

Plan the work. Work the plan.

— Henri

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References

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2. Jeukendrup AE. A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Med. 2014;44(Suppl 1):S25-33.

3. Maughan RJ, Shirreffs SM. Dehydration and rehydration in competitive sport. Scand J Med Sci Sports. 2010;20(Suppl 3):40-47.

4. Chapman RF, Stray-Gundersen J, Levine BD. Individual variation in response to altitude training. J Appl Physiol. 1998;85(4):1448-1456.

5. West JB. Respiratory physiology at high altitude. Exp Physiol. 2007;92(1):9-15.

6. Convertino VA, Armstrong LE, Coyle EF, et al. American College of Sports Medicine position stand: exercise and fluid replacement. Med Sci Sports Exerc. 1996;28(1):i-vii.

7. Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. American College of Sports Medicine position stand: exercise and fluid replacement. Med Sci Sports Exerc. 2007;39(2):377-390.

8. Stellingwerff T, Maughan RJ, Burke LM. Nutrition for power sports: middle-distance running, track cycling, rowing, canoeing/kayaking, and swimming. J Sports Sci. 2011;29(Suppl 1):S79-89.

9. Tarnopolsky MA. Nutritional consideration in the aging athlete. Clin J Sport Med. 2008;18(6):531-538.

10. Graham TE. Caffeine and exercise: metabolism, endurance and performance. Sports Med. 2001;31(11):785-807.

11. Thomas DT, Erdman KA, Burke LM. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: nutrition and athletic performance. J Acad Nutr Diet. 2016;116(3):501-528.

12. Ivy JL, Goforth HW Jr, Damon BM, McCauley TR, Parsons EC, Price TB. Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement. J Appl Physiol. 2002;93(4):1337-1344.

Note: The research papers provided (PMID:41922043 on exercise biomarkers, PMID:30503353 on bone health, PMID:36283059 on resistance training, PMID:40055626 on body composition and sleep, PMID:26590935 on testosterone and vascular health) address topics outside the direct scope of altitude half marathon nutrition and hydration. The citations above reflect the peer-reviewed literature most directly relevant to this topic.