Please ensure you have the correct course syllabus -this is Nutrition 2107-please see correct course syllabus on my website (under Nutrition 2107)

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Lecture 2 7 January 2015

Overview of Nutrition

Overview of lecture

1)Introduction -sports nutrition in a nutshell

2) Nutrition and Nutrients defined

3) Nutrients classified

4) Science of nutrition

5) Next lecture- 12 January- IDATME, DRIs, Canada’s food guide, food labels, physical activity guidelines

SPORTS NUTRITION IN A NUTSHELL

Choices of quantity and quality of nutrition have significant impact on athletic performance

“A Proper Diet Can’t Make An Average Athlete Elite, But A Poor Diet Can Make An Elite Athlete Average”

Nutrition-defined-narrow

science of what we eat and itsimpact on us through:

ingestiondigestion absorptiontransportmetabolism

excretion

IDATME

Nutrition-defined-broad

previous narrow definition

plus

psychology, economics, sociology, and culture of food and eating

Nutrients defined

chemical substances obtained from food and used in the body to provide:

-energy, structural materials and regulating agents to support growth, maintenance, repair of the body and athletic performance

-possible disease prevention and reduction

Nutrients classified

Energy yielding

Non-energy yielding

Non-nutrients

Energy yielding nutrients-all organic-carbon containing

CarbohydratesLipidsProteins

4/9/4 kcal/gm – remember calories are really kcal

17/37/17 kjoules/gm

-energy for warmth, body maintenance (build new compounds/turnover), movement

Non-energy yielding nutrients

-but can assist in deriving energy

Vitamins-organic

Minerals-inorganic-non-carbon containing

Water-inorganic

In food, nutrients are also classified as:

Essential or indispensable vs. non essential nutrients vs. conditionally essential

Also have non-nutrients-helpful, neutral, or harmful

AlcoholsPhytochemicalsAdditives- e.g. food colouringPreservatives- e.g. nitrogen containing

molecules that are anti-bacterial

Science of nutrition

Separating fact from rumour via studies:

Epidemiological (no intervention) -case-control, cross sectional, cohort

Experimental (intervention) - animal, in vitro (eg cell culture), human

Fig. 1-4, p. 14

Science of nutrition

-all investigations follow good scientific method:

question hypothesis data

interpret data conclude

question (s)

Fig. 1-3, p. 12

Summary of lecture

1)Introduction -sports nutrition in a nutshell

2) Nutrition and Nutrients defined

3) Nutrients classified

4) Science of nutrition

5) Next lecture- 12 January- IDATME, DRIs, Canada’s food guide, food labels, physical activity guidelines-please bring these last 3 on 12 January