How to use the glycemic index to choose the best pre- and post-workout meals

August 27, 2019 at 06:06PM by CWC

Even with all the information available on what to eat before and after a workout, it might seem tricky to find the right options to help you power through as well as properly recover. But maybe that’s just because you haven’t looked to the glycemic index yet.


The glycemic index essentially ranks foods based on how much of an impact it will have on your blood sugar levels. High GI foods, like white bread and table sugar, can cause a big spike in blood sugar levels, while low GI foods like chickpeas and even chocolate will have a less dramatic effect—which can help with regulating energy and mood.

While such food choices are important in your day-to-day life, it can be crucial to your fitness goals, too. We asked a registered dietitian exactly what you should be eating before and after your workouts for the best results, according to the glycemic index.

What to eat before workouts

While there’s been limited research on the impact of a low-glycemic-index diet on exercise, it could be beneficial for certain types of athletes. “A study in Nutrients on endurance runners eating a high-carb, low-glycemic-index diet for three weeks showed a small, yet significant, improvement in athletic performance for the runners,” says Amy Gorin, MS, RDN, owner of Amy Gorin Nutrition in the New York City area.

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“Before a hard workout, it’s important to have some protein and carbs so amino acids are made available to your muscles—and so your body won’t break down your muscles for protein,” says Gorin. She recommends focusing on proteins paired with a low-glycemic-index carbohydrate, such as a “cup of pasta, plus olives for healthy fat, spinach, and tomato,” about two to three hours before you exercise.

Photo: Madeline Hall

1. Soba noodle bowls with tofu and peanut sauce

A cup of non-white pasta, hearty protein like tofu, and veggies will do your body good pre-workout.


Photo: Hummusapien

2. Blueberry cacao smoothie bowl

This smoothie bowl is loaded with filling plant-based protein, berries, spinach, and healthy fats like hemp seeds and avocado.

Photo: Crazy Vegan Kitchen

3. Miso pesto pasta

You’ll feel like Popeye after devouring this bowl of pasta smothered in baby spinach.

What to eat after workouts

While high-carb, low-glycemic options are great pre-workout choises, meals with foods high on the glycemic index could be a better fit after.

A small study in Nutrients found men who ate high-glycemic-index meals opposed to low-glycemic-index meals after exercising had improvements in how long they slept and how well they slept following the workouts,” Gorin says. “After a hard workout, it’s very important to take in protein and carbs so that your muscles are able to repair and build strength. If you’re looking to eat a medium- to higher-glycemic-index-meal, you could go for instant rice with beans, plus chocolate milk blended with a banana and peanut butter. You would want to time a meal 30 minutes to 2 hours after a workout.”

Photo: Minimalist Baker

1. Roasted plantain and black bean bowl

This recipe has everything you could want in a post-workout meal, including plenty of rice and beans.

Photo: Detoxinista

2. Chocolate peanut butter banana smoothie

Refuel with a chocolate, PB, and banana smoothie that looks like a creamy milkshake.

Photo: Eating Bird Food

3. Copycat Chipotle tofu sofritas burrito bowls

Here’s your excuse to end your workout with a hearty burrito bowl.

For more healthy eating tips, find out the 10 cheap and nutritious foods a registered dietitian always snags at Whole Foods. Then read up on the brain foods a neuroscientist wants you to eat every day.

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Author Tehrene Firman | Well and Good
Selected by CWC