Everyday fueling for runners: eat for the runner you are, not race day

Beginners obsess over what to eat on race morning and ignore the thing that actually moves the needle: what they eat the other six days a week. Day-to-day fueling is where running fitness is built or quietly undermined.

Start with carbohydrate, because that's what running runs on. Carbs are stored as glycogen in your muscles, and that's the fuel your legs reach for first. For a runner doing about an hour a day, that means roughly 5–7 grams of carbohydrate per kilogram of body weight daily; push your training toward one to three hours a day and it climbs to 6–10 g/kg. Overall, carbohydrate should make up somewhere around half to two-thirds of what you eat. This isn't "carb-loading" — it's just keeping the tank from running low between runs.

Protein is the quieter half of the equation. It rebuilds the muscle that training breaks down, and runners need more of it than sedentary people — about 1.2–1.4 grams per kilogram of body weight per day. For a 150-pound (68 kg) runner that's roughly 80–95 grams, spread across the day rather than dumped into one meal.

Timing around runs is simpler than it sounds. Hydrate ahead: about 16–20 ounces of fluid roughly four hours out, then another 8–12 ounces in the 10–15 minutes before you start. On runs under an hour, 3–8 ounces every 15–20 minutes is plenty of water; once you cross an hour, make that a sports drink so you're replacing some carbohydrate and sodium too.

Recovery is where a lot of beginners leave fitness on the table. After a run, replace 16–24 ounces of fluid for every pound you lost, and pair carbs with a little protein — water, 100% juice, and chocolate milk are cheap, effective options. Get the everyday eating right and race-day nutrition becomes a footnote.

Source: Cleveland Clinic — Runners, Here's How To Fuel Up and Stay Hydrated