Tag Archive | "glycemic index"

Don’t Fear Carbs


Why Carbs Can be a Dancer’s Best Friend

By Emily C. Harrison MS, RD, LD.
www.dancernutrition.com

Want better jump height, more endurance, improved brain function and better fat burning? Then carbohydrates can be your best friend.

Should I eat a high protein, low carb diet?

There always seems to be yet another new bestselling, yet unscientific diet trend that touts low carb, high protein eating. These diets are not good for anyone, but this is especially so for the type of activity that dancers do. Certainly adequate protein is important, but the body would prefer to spare it for important physiologic functions, not burn it as fuel. Carbs provide the type of fuel that the muscles need for dance. High protein diets can lead to lower bone mineral density and increased risk for long-term diseases. Plus, such diets have not consistently shown to help with weight management over the long term 1,2,3.

Carbs can be found in wholegrain pasta, bread, rice, quinoa, barley, dairy, all vegetables and all fruits. Of course, you should avoid simple sugars in sweets, juices, soda, refined grains and baked goods. Sugar won’t give you enough energy to get through barre, but have a simple sandwich or pasta with veggies, and you’ll dance strong all the way through grande allegro. You won’t get that same level of sustained energy from a protein shake, or a big piece of meat before class.

Weight management and carbohydrates

The main reason people believe the hype about low-carb diets like Atkins, South Beach and Paleo diets is that they do aid in weight loss…. at first. For most people, much of the weight is gained back often with a few extra pounds to spare1. Yo- yo dieting is not what dancers need, especially when it is at the expense of their health or performance. Quick weight loss, a hallmark of low-carb diets, can lead to loss of lean mass (muscle). Going on any very low-calorie diet and losing muscle means losing the most metabolically active tissue the body has. In addition to lowering the metabolic rate, the body adjusts to the restricted calories, setting one up for an endless cycle of gaining and losing. A better strategy would be to limit simple sugars and eat smaller more frequent meals and snacks with fruits, vegetables, whole grains and legumes as the foundation.

Carbohydrates and performance

There is no better fuel for athletic performance and brain function than carbohydrates. Complex carbs in whole grains, vegetables and fruits give the muscles a prolonged source of energy. It has been found that giving athletes carb-based snack bars between meals results in better energy output and anaerobic power, while keeping weight the same and lowering body fat4.

In one study carbohydrate intake prior to exercise was shown to be as effective in improving repeated jump height as the supplement creatine 5. The carb group didn’t gain weight but the creatine group did5. The American College of Sports Medicine recommends that athletes get 55-60% of their total calories from carbohydrates, and whole grains are also important sources of fiber, B-vitamins, iron and folate.

How much, and when?

Here are a few real-life examples:   

Everyone is different, but if 2000 calories are needed then 55-60% should come from carbs. That is about 275-300 grams because carbs have 4 calories per gram. Carb needs can also be calculated based on grams per kilogram of body weight. In general, recommendations are 5-8 g/kg depending on intensity of activity. So a 120lb (54.5kg) female dancer would need at least 272 grams per day.

Examples:
1 piece of bread: 12-17 grams
1 apple: 25-30 grams
1 cup quinoa or brown rice: 39-45 grams
1 cup green beans 8 grams

Long, busy class and rehearsal days

Plan ahead so that carbs and protein are eaten within one hour post exercise the day before.  Carbs should be eaten in the range of 30-60 grams per hour during the rehearsal day.

Show or audition day

If a dancer is feeling nervous and doesn’t want food sitting on their stomach, then they should be well-fueled 3-4 hours prior to the show/ audition. Then an hour or so before, opt for easy to digest carbs like pretzels, crackers or a sports beverage. High-fat and high protein foods take a bit longer to digest, so eat these in moderation if you’re nervous. Re-fuel as needed if it is a long show.

Rest day

On well-deserved days off, a dancer still needs carbs but not in the same amount as a workday.  Cut back just a little bit, and eat lots of fruits and veggies.

The subject of carbohydrate intake is big, and can’t be covered in one article. Check out my earlier Dance Informa article on glycaemic index for additional information.

Emily Harrison
Emily Cook Harrison MS, RD, LD
Emily is a registered dietitian and holds both a bachelor’s and master’s degree in nutrition from Georgia State University, USA. Her master’s thesis research was on elite level ballet dancers and nutrition and she has experience providing nutrition services for weight management, sports nutrition, disordered eating, disease prevention, and food allergies. Emily was a professional dancer for eleven years with the Atlanta Ballet and several other companies. She is a dance educator and the mother of two young children. She now runs the Centre for Dance Nutrition and Healthy Lifestyles. She can be reached at emily@dancernutrition.com www.dancernutrition.com

Sources:

  1. Four-Year Follow-up after Two-Year Dietary Interventions N Engl J Med 2012; 367:1373-1374. October 4, 2012.
  2. Campbell TC, Campbell TM. The China Study. 2006. Benbella Books
  3. Rohrman S, et al. Meat consumption and mortality – results from the European Prospective Investigation into Cancer and Nutrition. BMC Medicine, 2013.
  4. Benardot D, et al. Between Meal Energy Intake Effects on Body Composition, Performance, and Total Caloric consumption in athletes. Medicine & Sci in Sports and Exercise V37. 2005.
  5. Koenig C, Benardot D, Cody M, Thompson W. Comparison of creatine monohydrate and carbohydrate supplementation on repeated jump height performance. Journal of Strength and Conditioning Research. 2008;22
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What is the Glycaemic Index? What Can it Do For You?


By Emily C. Harrison MS, RD, LD.

The Glycaemic Index is a tool that gives a numerical value to a specific amount of food based on how it affects your body’s blood sugar and insulin over a specific time period.  Foods with lower numbers don’t spike blood sugar as much as ones with higher numbers and provide more sustained energy.

Why does this matter to dancers?
Dancers who eat foods low on the GI tend to have more sustained energy overtime and more endurance. Not only can low GI foods improve performance, but when eaten before exercise they can help you feel more satisfied and may even help you burn more fat.  Whole grains, fruits, vegetables, beans, and peas are all considered good choices.

How to keep a low GI diet
Consider the importance of lowering the GI of your entire diet as a whole instead of picking out foods individually. Basically that means eat more whole foods. When low GI foods are consumed as part of an overall diet, there is a lower insulin response and better glucose control. A low GI diet as a whole helps you feel more satisfied after eating and leads to less overeating.  It is also important to eat smaller more frequent meals for good blood sugar control, to feel great, and to dance stronger.

GI facts

  • The GI is a numerical index used to describe how a carbohydrate is metabolized/ absorbed and its effect on blood glucose and insulin levels.
  • Consuming low GI carbs before endurance exercise results in increased fat oxidation during exercise in trained men and women.
  • Participants in a J. Nutr study reported feeling full following lunch in a low GI trial.
  • Consuming a low GI breakfast increases fat oxidation during exercise and improves satiety during recovery.  (J. Nutr. 139: 890–897, 2009).

Low GI food choices (better choices)

Whole grain/ high fibre breads
Brown rice, basmati rice
Oatmeal
Bran/ high fibre, WG cereals
Pasta (especially whole grain)
Most fruits
Most vegetables
Beans/ legumes
Nuts, seeds
Milk, dairy, soy

High GI foods  (not the best choices)

White rice
White bread
Sugar, honey, lollies
Cornflakes, Cheerios, Rice Bubbles, Coco Pops
Waffles, Pop-tarts
Baked potato, mashed potatoes
Pretzels
Baked goods, cakes, pies, muffins
Sugary drinks, soft drinks
Emily Harrison

Emily Cook Harrison MS, RD, LD
Emily is a registered dietitian and holds both a bachelor’s and master’s degree in nutrition from Georgia State University, USA. Her master’s thesis research was on elite level ballet dancers and nutrition and she has experience providing nutrition services for weight management, sports nutrition, disordered eating, disease prevention, and food allergies. Emily was a professional dancer for eleven years with the Atlanta Ballet and several other companies. She is a dance educator and the mother of two young children. She now runs the Centre for Dance Nutrition and Healthy Lifestyles. She can be reached at emily@dancernutrition.com www.dancernutrition.com

 

Resources:
www.glycemicindex.com
www.health.harvard.edu/newswee /Glycemic_index_and_glycaemic_load_for_100_foods.htm
http://lpi.oregonstate.edu/infocenter/foods/grains/gigl.html

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