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Nutrition. Sara R. Zwart, Ph.D. Nutritional Biochemistry Laboratory Johnson Space Center - NASA...
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Transcript of Nutrition. Sara R. Zwart, Ph.D. Nutritional Biochemistry Laboratory Johnson Space Center - NASA...
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NutritionNutrition
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Sara R. Zwart, Ph.D.Nutritional Biochemistry Laboratory
Johnson Space Center - NASA
Monica V. TrevathanEducation Specialist
Human Health and PerformanceJohnson Space Center - NASA
June 23, 2005
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Learning Objectives
• Describing the importance of proper nutrition for our bodies on Earth and for human space exploration.
• Identifying human body systems that are affected by inadequate nutrition (on Earth and in space).
• Explaining some challenges in nutrition and food for human exploration and long duration space flight.
Participants will expand their science content knowledge in the area of Nutrition by:
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Adaptation to Weightlessness• Muscle
• Fluid shifts, hematological
• Neurosensory
• Gastrointestinal
• Cardiovascular
• Taste & odor
• Sleep &circadian rhythm
• Psychological/ Behavioral/ Performance
• Environmental
• Bone
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What is the Function of Nutrition?
• Psychosocial aspects
• Meet energy/nutrient requirements
• Countermeasure
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Classroom Project Idea
• Go to www.mypyramid.gov• My Pyramid Tracker can track food intake for
24 hours and give a report
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Energy Intake
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Energy Intake
POLL QUESTION
In general, most astronauts eat less than their recommended intake. Does this necessarily mean they lose weight?
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Body Weight
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SLAMMD
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Vitamin D
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Vitamin D
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Vitamin D• Stimulates calcium absorption in the
intestine
• Deficiency can lead to:
– Rickets
– Osteomalacia
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Where is vitamin D
synthesized in the body?
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POLL QUESTION
Which of the following is NOT a source of Vitamin D?
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Nutrients Critical for Bone Health• Calcium
• Vitamin D
• Vitamin K
• Phosphorus
• Magnesium
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Bone
Bone breakdownBone formation
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Bone Loss Fracture Risk Stone Risk
Adapted from Heaney et al, 2000
Bone Loss
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Potential Countermeasures
• Nutrition
• Exercise
• Pharmacology
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Biochemical Markers of Bone Breakdown
• N-telopeptide • Helical peptide
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Sodium
Experiment days
NT
X (
nm
ol/d
)
Level of dietary sodium at each
stage of the study
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European Mir Mission (Days)
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Omega-3 Fatty Acids
• Beneficial effects on cholesterol, lipid metabolism, and cardiovascular health
• Inhibit muscle loss in subjects with hyper-catabolic diseases
• Protective effects on bone health
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Omega-3 Fatty Acids
• Clinical trial with cancer cachexia patients
(Wigmore et al. 1996)
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Animal protein/Potassium
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Chicken Bone in Acid
• In the classroom, use the “famous” chicken bone in acid lab experiment to demonstrate acid effects on bones
• See: http://haco.jsc.nasa.gov/pdf/pH Experiment.pdf
• ….plus, ideas for more on nutrition and bones!
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Next Stop: Mars!!
• Nutrition is critical due to length of missions
• Critical issues:
1. Are vitamins stable after exposure to deep-space radiation?
2. Are nutrients stable for long shelf life (up to 5 years)?
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Food System Issues
• Nutrient content• Palatability• Shelf-life • Preparation• Storage• Trash
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How will Extreme Conditions of Space Affect Food
Supply?• Closed food system• Radiation • Long-term storage • Depletion of a single nutrient could be
deadly after 3 years
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For Example…
• Easily destroyed by heat and light
• Deficiency – beriberi
– develops within 2-3 months
– neurological and cardiovascular effects
Vitamin B1 (thiamine)
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Another Example
• Deficiency–Scurvy– Bleeding around hair follicles, gums and
underneath fingernails
• Effects of radiation and long-duration storage are unknown for space flight
Vitamin C
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Nutrition Research
On Earth and in space:• Nutrition is more than just eating
food–Food choices are important
• Nutrition affects all body systems
• Countermeasures for conditions such as osteoporosis
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Related NASA Education Material
• National Space and Biomedical Research Institute
• Activities Guides for Teachers
• 5-8 grade
http://www.nsbri.org/Education/index.html
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Related NASA Education Material
• NASA CONNECT™• Math & Science
integration
• “Better Health from Space to Earth”
• Grades 5-8
http://connect.larc.nasa.gov
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Sara R. Zwart, Ph.D.Nutritional Biochemistry Laboratory
Johnson Space Center - NASA
Monica V. TrevathanEducation Specialist
Human Health and PerformanceJohnson Space Center - NASA