Nutrition %26 Health 1-2 %282011%29

Nutrition %26 Health 1-2 %282011%29 - BIOL 0126...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
1 BIOL 0126 Fundamentals of Biology Nutrition & Health by Edmund Li etsli@hku.hk Lecture Outline Circle of life Autotrophs & Heterotrophs Human (animal) nutrition Food energy Body temperature (endotherms and ectotherms) Metabolism and its determinants Energy balance Energy need & calories Nutrient density Body weight regulation Obesity Digestion, absorption and fuel usage Overview Absorptive unit and enzymes Fuel substrate metabolism Diet and Health Malnutrition (kwashiorkor) Nutrition issues Food pyramid Scientific methods to study nutrition
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Powerpoint files In WebCT ELI folder The Circle of Life Autotrophs & Heterotrophs
Background image of page 2
3 Photosynthesis Light reaction produces ATP, NADPH and H + Calvin-Benson cycle (dark reaction) produces O 2 and sugars Overall reaction 6CO 2 + 12 H 2 O Æ C 6 H 12 O 6 + 6O 2 + 6 H 2 O Photosynthesis splits water to liberate O 2 & fixes CO 2 into sugar Human Nutrition Essential Nutrients: Are those that a person must obtain from food because the body cannot make them or in sufficient quantity to meet physiological needs. About 40 nutrients are considered essential. Energy –yielding nutrients ( MACRONUTRIENTS ): carbohydrates, proteins and fats plus WATER and the MICRONUTRIENTS : vitamins and minerals What else do we need to sustain life?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 We eat to obtain food that provide us Energy and Nutrients ENERGY is obtained through oxidation of MACRONUTRIENTS Starr & Taggart, 2004 Energy The capacity to do work. The energy in food is chemical energy. The body can convert this chemical energy to mechanical, electrical or heat energy. Energy is measured in kiloCalories (kcal) or kiloJoules (kJ) One kcal is the amount of heat necessary to raise the temperature of 1 kg of water 1 o C.
Background image of page 4
5 Energy yielding food Kcal per g Carbohydrate 4 Protein 4 Fat 9 Alcohol 7 Dietary fibre 0-2 •For SI units, 1kcal = 4.184 kilojoules (kJ) Why do we need FOOD ENERGY?
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/12/2012 for the course BIOL 0126 taught by Professor Wux. during the Winter '11 term at HKU.

Page1 / 26

Nutrition %26 Health 1-2 %282011%29 - BIOL 0126...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online