NST10 0903 - NST 10 Healthy Diets2008-09-03 Outline...

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NST 10 – Healthy Diets 21:10 Outline Definition Planning a healthy diet How do we get nutritional information? o Epidemiological studies o Human studies o Clinical intervention studies and trials o Laboratory studies What is a diet? Food you eat (NOT what you eat to lose weight) Calories: Physics: energy needed to raise temp of 1 g water by 1 deg C Nutrition: Calorie = kilocalories 1 cal = 4.184 joules What nutrients are required in a diet? Macronutrients (for energy) Carbrohydrates (4 cal/g -> energy density) o TYPE of carbs eaten matters o Complex rather than simple (sugar) o Fibre – not completely digestible Fat (9 cal/g) o Essential fats required fr. Food
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Picture 1 o But type of fat influences health (eg saturated, etc) Protein (4 cal/g) o Provides amino acids o Should mix up types of proteins for diff types of amino acids Alcohol (7 cal/g) – but not required nutrient Micronutrients (do not provide energy) Vitamins, minerals Lack ability to make these on own, so must ingest Water Nutrients Organic compounds: carbon containing Inorganic compounds: water and minerals Phytochemicals Naturally occurring bioactive plant chemicals such as pigments reported to enhance health. Found in soy, garlic, onions, tea, coffee, broccoli
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NST10 0903 - NST 10 Healthy Diets2008-09-03 Outline...

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