Eat to compete: Dietary Supplements. Dietary supplements on the market are: –NOT regulated...
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Transcript of Eat to compete: Dietary Supplements. Dietary supplements on the market are: –NOT regulated...
Eat to compete:Dietary Supplements
• Dietary supplements on the market are:– NOT regulated– Could contain illegal
substances– Could be costly– Could be harmful
Current laws on dietary supplements
• No requirement for efficacy (proof they do what they claim)
• No requirement for safety (proof they cause no harm)
FDA initiatives
• Implement process to evaluate dietary supplements
• Set standards for consistency
• Provide guidance on what claims can be made
Advice for youth
• Consult with a healthcare professional, MD, pharmacist, or registered dietitian
Dietary supplements include
• Any product intended to supplement dietary intake
• Examples– Vitamins/Minerals– Herbs and Botanicals– Protein/Amino Acids
Herbs and Botanicals
• Dietary supplements that contain extracts or active ingredients from plants
• Some are harmful– Kava Kava is banned in Canada
St. John’s Wort
• Suggested to help depression• Negative side effects • No tests on long-term safety
Ginkgo biloba
• Increases blood flow to brain• Large doses can cause
restlessness, diarrhea, nausea, vomiting
Echinacea
• Believed to stimulate immune system
• Studies use echinacea concentrate - not the same as what is sold
Ginseng
• Clinical tests show mixed results for claims
Green tea
• May boost immune system, increase metabolism, act as antioxidant, lower cholesterol and triglycerides
Ephedra
• Central nervous system stimulant and decongestant
– Claims:• Increases body fat loss• Improves athletic performance by
increasing alertness and mental performance
Ephedra
• Negative side effects• irregular heart rate, elevated blood
pressure, dizziness, headache, heart attack, stroke, seizure, psychosis
• 155 deaths and over 16,000 side effects
• FDA banned in April, 2004
Risks of Herbal Supplements
• No standards exist• Little scientific evidence is
available• Can be potent
Resources
• Iowa Botanicals Research Center– http://
www.cdfin.iastate.edu/botanical/index.htm
• Iowa State University Extension– http://www.extension.iastate.edu/nutr
ition/supplements/
Creatine
• Natural substance produced by body
• Claims:– Improve muscle power during high
intensity and short duration exercise
Creatine problems
– Could cause muscle cramps, headaches, diarrhea, and gastrointestinal pain; stress on kidneys
– Long term effects are unknown– YOUTH: muscles develop more
quickly than bone… increases risk of fractures
Creatine Summary
• Pros– Has been proven to increase energy in
short duration, repetitive exercises (<60 sec)
• Cons• No benefit in aerobic ability or endurance• Weight gained is mostly water weight and not
muscle, which can hinder performance• Negative side effects are a possibility• Not approved by FDA and labels may be
incorrect
Protein/Amino Acids
• Essential macronutrient found in the body and in food
• Protein supplement food sources include
• Egg• Soy• Whey
Amino Acids Supplements
• Pre-digested protein• Claim
• Because they are pre-digested, they will be absorbed better.
• Fact• The body gets better use out of amino
acids if they are broken down from whole
foods.
Amino Acid SupplementsAmino 2000Amino Acid Supplemen
t
ChickenBreast
100% Whey Protein
Supplement
Protein/Serving
30 g /18 tablets
31 g / 3.5 ounces
23 g / 1 scoop
Price/31g of Protein
$4.03 $0.62 $0.93
Amino Acid SupplementsAmino Acid Profiles
0
1
2
3
4
5
6
7
3.5 oz 1 1/3 scoops 18 tablets
Chicken Breast Whey ProteinSupplement
Amino AcidSupplement
Food or Supplement
Am
ino
Ac
ids
(g
ram
s)
Glutamine
Alanine
Isoleucine
Leucine
Valine
Protein• Claims for supplementation
• Supports muscle growth• Increases muscle strength and mass• Improves recovery
• Problems with supplementation• Dehydration • Stress on kidneys• Increased calcium excretion • Reduced intake of vitamins, minerals, fiber, and
phytochemicals
Adolescent growth
• Rapid growth and change increases need for iron and calcium
Iron
• Anemiacommon among adolescents --> inadequate diet
• Food sourceslean meat, fish, dried fruits, nuts,
wholegrain breads• Supplementation
may improve learning, memory, and performance of iron-deficient adolescents
Calcium
• Deficiencydecreased bone mineral density
-->inadequate diet
• Food sourcesdairy products (milk, yogurt, cheese)
• Supplementationbeneficial if unable to get from food sources
If Using Supplements
• Choose supplements with:– USP on the label– Consumer Lab seal of approval– Reputable drug companies
If Using Supplements
• Watch for inaccurate and inappropriate health claims1. Promises a quick fix2. Sounds too good to be true3. Lists of “good” and “bad” foods
If Using Supplements
• Remember that they don’t have to…– prove safety prior to marketing/selling– prove efficacy prior to
marketing/selling– meet any manufacturing standards
Conclusion
• Supplements are not needed with a balanced diet
• Supplements are not regulated on the market and can be unsafe
• Choose wisely and consult with a healthcare professional for more information
• Funded by: Iowa Beef Industry Council, Midwest Dairy Association
• Prepared by: Ruth Litchfield, PhD, RD, LD– Contributions by Emily Lasley, Lindsey Metcalf,
Andrea Seminara and Karin Westberg
. . . and justice for all
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, gender, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Many materials can be made available in alternative formats for ADA clients. To file a complaint of discrimination, write USDA, Office of Civil Rights, Room 326-W, Whitten Building, 14th and Independence Avenue, SW, Washington, DC 20250-9410 or call 202-720-5964.
Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Stanley R. Johnson, director, Cooperative Extension Service, Iowa State University of Science and Technology, Ames, Iowa.