{"id":495,"date":"2026-07-30T23:17:26","date_gmt":"2026-07-30T23:17:26","guid":{"rendered":"https:\/\/stezia.run\/?p=495"},"modified":"2026-08-12T11:06:18","modified_gmt":"2026-08-12T11:06:18","slug":"trail-running-nutrition-how-many-carbs-per-hour-do-you-need","status":"publish","type":"post","link":"https:\/\/stezia.run\/ru\/trail-running-nutrition-how-many-carbs-per-hour-do-you-need\/","title":{"rendered":"Trail Running Nutrition: How Many Carbs Per Hour Do You Need?"},"content":{"rendered":"

Nutrition failures end more trail races than injuries do \u2014 and almost all of them are preventable with a plan made before the start line, not decisions made at kilometer 40 with an empty tank. This guide covers the actual numbers: how many carbs per hour you need, how that scales with your body weight, how much water and sodium to pair with it, and why most runners who “bonk” are simply under-fueling, not doing anything more complicated than that. Nutrition is one part of a full trail running training plan<\/strong><\/a> \u2014 it needs to be trained, not improvised on race day.<\/p>\n\n\n\n

Why Glycogen Runs Out Faster Than Most Runners Think<\/strong><\/h2>\n\n\n\n

Your body’s glycogen stores \u2014 the fuel your muscles pull from during sustained effort \u2014 run out after roughly 60 to 90 minutes of continuous exercise. This is true for every trail runner, at every fitness level, on every race longer than about 90 minutes. It’s not a sign of poor fitness; it’s basic exercise physiology that applies whether your finish time is 3 hours or 15.<\/p>\n\n\n\n

The practical implication: fueling isn’t something you start once you feel hungry or tired. By the time hunger or fatigue shows up, you’re already running on a deficit you can’t fully recover from mid-race. Eating on a schedule, not by feel, is the single highest-leverage nutrition habit in the sport.<\/p>\n\n\n\n

How Many Carbs Per Hour You Actually Need<\/strong><\/h2>\n\n\n\n

The widely supported range for endurance efforts over roughly 2\u20133 hours is 60\u201390 grams of carbohydrate per hour<\/strong>, confirmed across sports nutrition research (see the review in Nutrition for Ultramarathon Running: Trail, Track, and Road, PubMe<\/a><\/strong> and echoed consistently across coaching resources in the sport.<\/p>\n\n\n\n

That range scales with body size. A practical formula: estimate your hourly calorie burn at roughly 700 kcal\/hour for a 70kg runner, scaled proportionally to your own weight, then take about 40% of that from carbohydrate sources (carbohydrate providing 4 calories per gram):<\/p>\n\n\n\n

“`<\/p>\n\n\n\n

calories\/hour \u2248 700 \u00d7 (your weight in kg \/ 70)<\/p>\n\n\n\n

carbs\/hour \u2248 min(90, calories\/hour \u00d7 0.4 \/ 4)<\/p>\n\n\n\n

“`<\/p>\n\n\n\n

The 90g\/hour figure isn’t arbitrary \u2014 it’s the generally accepted ceiling for carbohydrate absorption even when using a mixed glucose-and-fructose source (which allows for faster gut absorption than a single sugar type alone). Going above it doesn’t reliably deliver more usable fuel; it mostly increases the risk of GI distress.<\/p>\n\n\n\n

In gel terms, since that’s how most runners actually fuel: one standard energy gel is roughly 20\u201322g of carbohydrate. At a 70g\/hour target, that’s about 3 gels an hour \u2014 one roughly every 20 minutes, not one “whenever it feels like time.”<\/p>\n\n\n\n

The Most Common Mistake: Under-Fueling, Not Over-Fueling<\/strong><\/h2>\n\n\n\n

Despite the well-documented 60\u201390g\/hour target, real-world data on ultra runners consistently shows most people fall well short of it \u2014 one commonly cited figure from race-day nutrition tracking puts the average closer to 37 grams of carbohydrate per hour<\/strong>, roughly half of the low end of the recommended range. That gap is a large part of why “hitting the wall” happens to experienced runners, not just beginners \u2014 it’s usually a fueling math problem, not a fitness problem.<\/p>\n\n\n\n

Water and Sodium \u2014 Getting the Ratios Right<\/strong><\/h2>\n\n\n\n

Hydration needs are lower than most runners assume, and they don’t scale linearly with effort the way carbohydrate needs do. A reasonable baseline is 500 ml of water per hour<\/strong>, rising to roughly 600 ml\/hour<\/strong> for efforts past the 6-hour mark. Sodium should scale proportionally with your water intake \u2014 roughly 600mg of sodium for every 750ml of fluid consumed.<\/p>\n\n\n\n

This matters because muscle cramps are usually a sodium problem, not a hydration problem.<\/strong> Drinking more water without replacing electrolytes can actually worsen cramping by further diluting sodium concentration in the blood (a real medical condition called hyponatremia in severe cases). The fix isn’t more water \u2014 it’s electrolytes on a schedule, roughly every 30\u201345 minutes, regardless of how thirsty you feel.<\/p>\n\n\n\n

Carb-Loading Before Race Day<\/strong><\/h2>\n\n\n\n

The 24\u201348 hours before a long race matter more than most runners’ pre-race routines reflect. A reasonable carbohydrate loading target is 10\u201312 grams of carbohydrate per kilogram of body weight<\/strong> in that window \u2014 for a 70kg runner, that’s roughly 700\u2013840g of carbohydrate spread across a day and a half, meaningfully more than a typical diet. Race morning is too late to start this process; glycogen stores take time to build.<\/p>\n\n\n\n

Training Your Gut Like You Train Your Legs<\/strong><\/h2>\n\n\n\n

The gut adapts to nutritional load the same way muscles adapt to physical load \u2014 through repeated, specific practice. Most runners never rehearse race-day nutrition until race day itself, then are surprised when their stomach shuts down at kilometer 40 on a product or timing they’ve never actually tested.<\/p>\n\n\n\n

The fix is straightforward: starting in the specific-endurance phase of training (roughly 8\u201312 weeks before an ultra-distance race) and continuing through peak training weeks, use every long run as a nutrition rehearsal \u2014 the exact products, in the exact timing and order, that you plan to use on race day. There should be no surprises left for the actual event.<\/p>\n\n\n

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\n
\n

How much elevation gain is considered “a lot” for a trail race?<\/strong><\/h3>\n
\n\n

There’s no universal cutoff, but elevation-per-kilometer above roughly 50 m\/km (for example, 2,500m of gain over a 50K) generally means descent technique and climbing-specific strength matter as much as overall fitness.<\/p>\n\n<\/div>\n<\/div>\n

\n

Should I train elevation gain even if my race is relatively flat?<\/strong><\/h3>\n
\n\n

Some vertical training builds useful strength and running economy regardless, but the aggressive progression described here is specifically for races where elevation is a major limiter \u2014 don’t over-invest training time in vertical for a genuinely flat course at the expense of speed work that race actually rewards<\/p>\n\n<\/div>\n<\/div>\n

\n

Can I substitute a treadmill for real hill training?<\/strong><\/h3>\n
\n\n

Yes for the uphill component \u2014 an incline treadmill set to 10\u201315% is a reasonable substitute for hill repeats when terrain isn’t available. It does not substitute for descent training, which requires real eccentric loading on uneven terrain to build the specific adaptation.<\/p>\n\n<\/div>\n<\/div>\n

\n

How long before my race should I stop building elevation volume?<\/strong><\/h3>\n
\n\n

Peak elevation training volume should generally land 2\u20134 weeks before race day, followed by a taper \u2014 continuing to add vertical load into the final two weeks risks arriving at the start line with unresolved muscle fatigue rather than freshness.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Nutrition failures end more trail races than injuries do \u2014 and almost all of them are preventable with a plan made before the start line, not decisions made at kilometer 40 with an empty tank. This guide covers the actual numbers: how many carbs per hour you need, how that scales with your body weight, […]<\/p>\n","protected":false},"author":2,"featured_media":496,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/posts\/495","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/comments?post=495"}],"version-history":[{"count":3,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/posts\/495\/revisions"}],"predecessor-version":[{"id":601,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/posts\/495\/revisions\/601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/media\/496"}],"wp:attachment":[{"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/media?parent=495"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/categories?post=495"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stezia.run\/ru\/wp-json\/wp\/v2\/tags?post=495"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}