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How to Fuel Up Before and After Your Workout

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Food is fuel, no matter when you eat it. But in the hours surrounding a workout, nutrition has a direct effect on your body’s performance and recovery.

The foods you consume can determine whether you bonk while running, get queasy during a HIIT session, or feel hangry in yoga class.

“Often the best chance of having a quality workout is eating something beforehand,” says Marni Sumbal, MS, RD, a board-certified sports dietitian in Greenville, S.C., who works primarily with endurance athletes. “When people fuel better, they tend to have more energy, bounce back more quickly, and feel less fatigued overall.”

But there’s conflicting information surrounding nutrition and exercise, making it confusing to know what to eat and when to eat it. The best piece of ­advice for people looking to get stronger and fitter might just be to follow your gut — both literally and figuratively.

If your stomach feels uncomfort­able during a workout, you likely need to tweak the timing or content of your most recent meal. And if you’re feeling weak, cranky, or unfocused during or after exercise, you may simply not have eaten enough before or afterward.

“If you find yourself thinking, I should be able to . . . or I used to be able to . . . during a workout, something could be off with how you’re fueling,” Sumbal explains.

“You can’t enjoy exercise when you’re hungry,” says Susan Kleiner, PhD, RD, owner of High Performance Nutrition in Mercer Island, Wash. “If you fuel yourself well, you should be able to get to the end of your workout fatigued from exercise, not fatigued from being underfed.”

Even if you’ve found something that’s worked for you in the past, it’s worth ­reassessing your diet as your body adapts to workouts and your goals change.

“Your pre- and postworkout nutritional strategy can change over time, depending on where you are in your program and what you want to accomplish,” explains Life Time nutrition program manager Paul Kriegler, RD, LD. For individualized guidance, he recommends connecting with a fitness or nutrition professional.

Whether you’re a seasoned athlete or training for the first time, addressing pre- and postworkout nutrition can make the difference in energy, performance, recovery, and, ultimately, results.

Preworkout Priorities

For low- and moderate-intensity workouts shorter than 90 minutes, you’re mostly fueling your movement through a mix of fat and glycogen stored in your muscles, says Sumbal. The best way to optimize energy stores is to eat well throughout the day — incorporating a balance of complex carbs, high-quality protein, and healthy fats.

It’s also a good idea to wait at least two hours after a meal before exercising, even for a low-intensity workout, so that your stomach doesn’t have to compete with your muscles.

If you’re heading to an early-morning Pilates class and not feeling hungry, you probably don’t need to eat beforehand. Some people feel fine working out on an empty stomach, and if the physical demands are not especially high, your muscles can get the fuel they need from stored sources.

But if it’s been a while since your last meal and you’re feeling hungry, reach for something small at least 20 to 30 minutes before you work out, advises Sumbal. Low-fiber carbs paired with protein make for an energy-boosting snack that’s easily digestible.

“A snack can help you think better, have more energy, stave off hunger pangs, and control your blood sugar to prevent lightheadedness,” she says. So if you’re struggling to get through a workout, your body may just need a little pick-me-up.

When it comes to high-intensity or heavily anaerobic workouts of 90 minutes or more, carbs are king. Of the three macronutrients — carbohydrates, protein, and fat — carbs are the ones that provide immediate energy.

“You can’t reach the same levels of intensity physiologically without carbs to burn,” says Kleiner.

To minimize potential damage to your muscles during strenuous training sessions, you also need to prioritize protein, says Kriegler. For most healthy people, he recommends at least 20 to 30 grams of protein, with a ratio of up to 3 grams of carbs for each gram of protein, depending on individual needs.

It’s not always feasible to wait two hours after breakfast before a morning sweat session, and sometimes we find ourselves heading into high-intensity workouts hours after our last meal. In these cases, Kleiner recommends having a 200- to 300-calorie snack about 60 to 90 minutes prior to your workout. Choose easily digestible carbs paired with a little protein, such as a banana with nut butter.

The closer you are to your workout, the more likely you’ll benefit from getting your carbs and proteins from liquids, Kriegler advises. If you enjoy a tough morning session, a preworkout smoothie might be your best option.

Postworkout Window

As soon as you complete a workout and for the next couple of hours afterward, your muscles are primed to accept nutrients that support recovery. Specifically, carbs replace stored glycogen in muscles and help shuttle amino acids from protein into the muscles, supporting repair and growth.

“The priority is to get carbs and protein into your body as soon as possible so it can get right to work replenishing energy stores and repairing tissue,” says Kriegler. This is especially important after heavy anaerobic and high-intensity training.

If a tough workout leaves you with no appetite, Sumbal recommends drinking your recovery fuel, such as a yogurt drink or protein-packed smoothie. Otherwise, eat a meal or substantial snack, prioritizing whole foods with complex carbs and protein.

If your workout is shorter than an hour and is of low or moderate intensity, you can simply wait an hour or two before eating. Avoid high-fiber and high-fat foods, since they tend to slow digestion and delay nutrient absorption, Kriegler says.

Even if your goals include weight loss, refueling your body is crucial for continued progress. “It is a misconception that exercise is the opportunity to restrict calories,” says Kleiner. “If we undercut exercise, we’ll never get the results we want.”

All-Day Fuel

Much of fueling your workouts happens when you’re not exercising. Consider these basic nutrition principles for an active lifestyle.

Hydration: “One of the biggest mistakes I see people make is being chronically underhydrated,” says Kriegler. He recommends at least half an ounce of water per pound of body weight every day, and an additional 16 to 20 ounces per hour of sweating.

Carbohydrates: Vegetables, fruits, whole grains, and other complex carbs provide a lasting source of energy. They’re an important dietary component for anyone who is physically active. In general, aim to get 40 to 60 percent of your calories from healthy carbs. (For more on determining your unique carb tolerance, visit “What Is Your Unique Carbohydrate Tolerance?”.)

Protein: Protein is crucial for maintaining muscle tissue and supporting muscle repair and growth. For those trying to build muscle, experts suggest aiming for 1 gram of protein per pound of body weight, or 1 gram per pound of desired body weight, per day, which is roughly double the current RDA (recommended dietary allowance).

Fat: Healthy fats are an important source of energy. Ideally, they’d make up at least 20 percent of your diet. Prioritize nuts, avocados, olives, and olive oil, and avoid trans fats, which are known to increase inflammation and disrupt your body’s repair-and-recovery process.

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Health & Fitness

Lentil and Mushroom Shepherd’s Pie

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DIRECTIONS

Preheat the oven to 400 degrees F and lightly oil a 9-x-13-inch baking dish.

In a 2-quart pot, bring the vegetable stock and lentils to a boil over high heat. Reduce the heat to medium low, cover, and cook until the lentils are tender but not falling apart, about 20 to 25 minutes. Drain the lentils and reserve the stock. Measure the stock and add water, if needed, to make a 1/2 cup.

While the lentils are cooking, place the parsnips in a second large pot and cover with water by an inch. Bring to a boil over high heat, then reduce the heat to medium and cook until the parsnips are tender when pierced, about 10 minutes. Drain, then place the parsnips in a food processor. Purée until smooth, scraping down the sides as needed. Add the nondairy milk, 1 tablespoon avocado oil, and 1 teaspoon salt, and purée to mix.

In a large skillet, warm the remaining avocado oil over medium-high heat. Add the onion and cook until it begins to sizzle, about two minutes. Reduce the heat to medium, and add the mushrooms, carrots, and remaining salt. Cook, stirring occasionally, until the mushrooms are shrunken and browned and other veggies are tender, about 15 minutes.

Add the thyme, sage, pepper, flour, and tomato paste. Stir until combined, then add the reserved stock from the lentils and bring to a low boil. Cook for about two minutes, then turn off the heat. Stir in the peas and cooked lentils, then scrape the mixture into the baking dish and smooth the top.

Spread the parsnip purée over the lentil mixture. Sprinkle with the paprika.

Bake until lightly browned and bubbling, about 35 minutes. Let stand for 10 minutes before serving.

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