Fitness gets you to the start line. Fueling decides what happens during the race.
You can run every interval, every long run, every taper-week stride exactly right and still detonate if your race-day plan is improvised.
This is the version of the playbook we use ourselves. It applies to any race longer than 90 minutes — half marathons, marathons, ultras, ironmans, etc.
Three caveats up front. Individual variation is real; treat the numbers as starting points. Don't try anything in this article for the first time on race day. And every prescription here assumes "average athlete in average conditions", while heat, altitude, and elite paces all bend the math.
The week before - carb loading
If your race is under 90 minutes, skip this section. There isn't enough glycogen demand to justify the load.
For everything longer, modern carb loading is much simpler than the cycle the 1960s Scandinavian researchers invented. You don't need a depletion phase. You don't need to suffer through a no-carb week. You don't need a thousand grams of pasta on Friday night.
The current evidence-based protocol: in the 1 to 3 days before the race, eat 8 to 12 grams of carbs per kilogram of body weight per day. For a 70 kg (155 lb) runner, that's 560 to 840 grams of carbs daily — a meaningful jump from a typical 4 to 6 g/kg training day. Pair it with reduced training volume during taper and your muscles will super-compensate, storing more glycogen than usual.
Practical version: shift the ratio of your meals toward easy carbs, away from heavy fat and high fiber. Rice, pasta, bread, potatoes, fruit, oatmeal, pancakes. Lean protein in moderate amounts. Less salad and dry vegetables than usual as fiber slows things down, and you don't want unnecessary mass in your gut on race morning.
Two side effects to expect. You will gain three to five pounds. Glycogen binds water at roughly 3 grams per gram, so a fully loaded athlete walks around with extra fluid. This is fuel, not bloat. And you may feel sluggish on a taper run after a heavy carb day. That's normal. Trust the protocol.
The night before
The dinner-the-night-before-the-race myth has caused more carb-induced misery than it has ever prevented bonks. Don't eat the largest pasta plate of your life at 8 PM.
Three rules for race-eve dinner: familiar, moderate, low-fiber. Eat something you've eaten before a long run, in roughly the portion you'd normally eat. Skip foods that take a long time to clear the gut, such as heavy fats, cream sauces, large portions of fibrous vegetables, beans. Skip alcohol; it dehydrates and disrupts sleep and you don't want either of those on race day.
Hydrate steadily through the day, but stop chugging in the evening so you're not waking up at 3 AM to pee. A salt-rich dinner or a small electrolyte drink helps your body hold onto fluid overnight without diluting it.
Lay everything out before you sleep. Race-morning decision fatigue is a real, small leak you can plug.
Race morning - 2 to 3 hours before the start
Eat your "race-morning breakfast" two to three hours before the gun. The window matters. Too close to the start and your gut is still working when you ask it to compete; too far away and your blood glucose dips into the start.
Target 1 to 4 grams of carb per kilogram, adjusted for your stomach. A 70 kg runner is in the 70 to 280 g range, which is a wide window because gut tolerance varies enormously. Most experienced marathoners land somewhere between 100 and 200 g.
What to eat: bagel with jam and a banana. Oatmeal with honey and berries. White rice with maple syrup. Toast and peanut butter. Pancakes. The point is high-carb, low-fiber, low-fat, and familiar. Black coffee if you train with it, the caffeine helps and the gut tolerance is already proven.
Don't try cold brew you've never had. Don't try a new energy bar. Don't try egg whites if you don't normally eat them on long-run days. Race morning is the worst possible time to introduce a variable.
Race morning - 60 minutes before the start
There are two camps here, and you should know which one you belong to.
Camp one: a small top-up 30 to 60 minutes before the start, such as a gel, a banana, half a sports drink. Total 30 to 50 grams of carb. Tops off blood glucose and primes the stomach.
Camp two: nothing in the last hour. Some athletes get reactive hypoglycemia from a carb hit just before exercise. Blood sugar spikes, insulin responds, then both crash right when you need them. If you've felt that before (lightheaded at mile two), you're a camp-two athlete and you should fuel only during the race.
The only way to know which camp you're in is to test it on a hard training run. You should know before race day.
A small caffeine dose 30 to 60 minutes before the start is worth considering. 1 to 3 mg per kg of body weight, which is roughly the amount in a normal cup of coffee for most adults. Caffeine raises perceived-effort threshold and improves endurance performance in ways that are well-documented. Don't overdose. Jittery is not faster.
During the race - the math
This is where most amateur fueling plans collapse. Athletes know they should "eat something" but don't have a number. Here's the number.
For races between 1 and 2.5 hours: 30 to 60 grams of carbs per hour.
For races over 2.5 hours: 60 to 90 grams per hour, using a mix of glucose and fructose. Pure glucose tops out at about 60 g/hr because the gut runs out of glucose transporters. Mixing in fructose, which uses a different absorption pathway, raises the ceiling.
For ultras: trained athletes can push 90 to 120 g/hr, but it requires deliberate gut training over weeks of long runs.
The cadence is what matters. Don't take 60 g in one shot at hour two. Trickle it in with a feeding every 15 to 25 minutes, starting within the first 30 minutes of the race. The goal is steady blood glucose, not intermittent rescue.
A practical example: a 4:00 marathoner aiming for 60 g/hr is taking in about 240 g across the race. That's roughly eight or nine pouches at 27 to 30 g each, one every 25 to 30 minutes from mile two onward.
Don't wait for the wall. The wall is what happens when you've already lost.
Fuel before you feel like you need to. The tank you're filling is bigger than you think it is.
Hydration and sodium
Drink to thirst, not to a schedule, in most conditions. Modern endurance science has moved away from the old "drink ahead of thirst" advice because of overdrinking risks. In hot or long races, lean toward 400 to 800 ml of fluid per hour, but adjust for your sweat rate.
Sodium is non-negotiable in heat or long efforts. Most athletes lose 800 to 1,200 mg of sodium per liter of sweat; salty sweaters lose 2,000 or more. Match it. For a 4:00 marathon in moderate heat, that's 2,000 to 4,000 mg of sodium across the race spread between fluid, gels, and any salt capsules.
Plain water without sodium for hours is how runners end up with hyponatremia. Symptoms blur with bonking, confusion, fatigue, nausea, but the fix is opposite. More salt, less water.
Right after the finish
The first hour after a hard race is the highest-leverage glycogen replenishment window. Glycogen synthase activity is elevated, muscles are insulin-sensitive, your gut is open for business.
Target in the first 60 minutes: 1.0 to 1.2 grams of carb per kilogram of body weight, plus 20 to 30 grams of protein. For our 70 kg runner: 70 to 84 grams of carb and 20 to 30 grams of protein. A bagel with peanut butter, a smoothie with yogurt and fruit, chocolate milk and a banana, anything in the rough ratios works.
Hydrate with electrolytes, not just water. Body weight is a quick check: if you're 3% lighter than you were at the start, you're moderately dehydrated and need more than thirst is telling you.
Eat a real meal within the next 2 to 3 hours. Sleep soon after if your race was long. Recovery is when fitness actually compounds.
The most important rule
Don't try anything new on race day.
This is the rule above all the others. New gel flavor? Test it first. New shoes? Train in them. New breakfast cereal? Eat it on the morning of a long run before you eat it on the morning of a race. The taper is not the time to optimize.
If you've trained with FORFUEL, race with FORFUEL. If you've trained with anything else, race with that. The number-one cause of race-day GI disasters is athletes panic-grabbing a "better" fuel they've never used.
Why we built FORFUEL for this
Every choice we made was about fitting cleanly into this playbook. 27 grams of carbs per pouch. Easy math at 60 g/hr (one every 25 minutes) or 90 g/hr (one every 18). Glucose-fructose ratio built in by the maple, so the gut-transporter math works without having to read labels. 150 mg of sodium so a normal feeding cadence keeps you ahead on the electrolyte ledger. Real-food sugars so the gut doesn't rebel after the eighth one.
We built it to be the most simple, predictable, easy-to-trust asset for you on race day.
