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What, when, and how much should you eat postrun? That depends on the workout.
By Sarah Bowen Shea

This article is from Runner's World (title is linked above) and is longer than what I put in below. I just put in the parts I didn't want to forget!

Postrun: After a 45-minute run, you're short on time.

Eat This: For many runners, this type of workout is the backbone of their training, especially on time-crunched weekdays. For runs less than 60 minutes, don't worry about getting exactly the right ratio of carbs-to-protein postrun; rather, focus on eating foods that contain both. "It's when you run over an hour that the carbs-to-protein ratio becomes more important," says Jamieson-Petonic. Just aim for healthy choices. If you run in the morning, freeze a fruit and yogurt smoothie the night before and take it out to defrost before your run. If you're a noontime runner, pack a hummus and veggie pita sandwich to eat after you get back to your desk. Need a quick dinner after an evening run? Keep your freezer stocked with single, frozen chicken breasts or salmon fillets and pair with fast-cooking brown rice and steamed asparagus.

Postrun: You ran long and hard, and you're tired.

Eat This: When you run longer than an hour, you need to focus on refueling—and fast. "There's a 30-minute window where the body is very receptive to getting carbs back into the muscles," says Shulman. To know your carb needs, divide your weight in half. If you weigh 140 pounds, you need 70 grams (280 calories) of simple carbs within 30 minutes. Try energy bars or sports drinks because they're quickly absorbed. Getting some protein, too, will kick-start muscle repair. Within an hour of that snack, eat a full meal, ideally in a 4:1 carbs-to-protein ratio. According to a 2006 study in Medicine and Science in Sports and Exercise, eating carbs and protein together increases glycogen levels more than eating just carbs. Try a bean burrito or pasta with meat sauce to give your body the nutrients it needs, says Shulman.