6 - General Nutrition Flashcards
What is metabolism?
The chemical processes that occur within a living organism in order to maintain life
What are anabolic and catabolic processes?
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Why do we need energy?
- Mechanical work
- Transport work
- Biosynthetic work
- Electrical work
How is ATP produced?
Oxidation of:
- Lipids
- Alcohol
- Carbohydrates
- Proteins
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What is the SI unit of food energy?
kJ (1000J)
1kCal = 4.2 kJ
(when packets say 100 cal, they actually mean 100kCal)
What is the definition of a kCal?
Amount of energy required to raise the temperature of 1kg of water by one degree celsius
What do we need in our diet and what is essential?
- Carbohydrates - energy
- Protein - energy and aa
- Fat - energy and essential
- Minerals - essential
- Vitamins - essential
- Water
- Fibre - GI function
What is the general structure of carbohydrates?
(CH2O)
Contain ketone and aldehyde groups and multiple OH’s
What is a dextrin?
Oligosaccharide (3-12 units)
Why is cellulose essential and why can’t we digest it?
- Needed for GI function
- Used to lower cholesterol and risk of diabetes
- Low fibre intake associated with bowel cancer and constipation
- We don’t have enzymes to hydrolyse b 1-4 linkages
What are the three disaccharides and what are they made of?
- Sucrose (glucose and fructose)
- Lactose (glucose and galactose)
- Maltose (glucose and glucose)
What amino acids are essential?
If Learned This Huge List May Prove Truly Valuable
- Isoleucine
- Leucine
- Threonine
- Histidine
- Lysine
- Methionine
- Phenylalanine
- Tryptophan
- Valine
What are conditionally essential amino acids?
Not always essential but under certain circumstances they are (e.g illness and stress) as there is a high rate of protein synthesis
e.g pregnant women and children need some tyrosine, arginine and cysteine
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Why do vegetarians sometimes have illness?
- Can’t get all essential amino acids from a single plant like you can with single bit of meat
- Need wide variety of plant sources as vegetarian
What are lipids composed off and why are they essential?
- Triacylglycerols
(more reduced than carbohydrates so release more energy)
- Needed for absorption of fat soluble vitamins (A,D,E,K)
- Provide essential FA, linolenic and linoleic acid
Why is linolenic acid essential?
Used to make phospholipids
What minerals are essential and what for?
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To maintain water and electrolytes in the body what is recommended to administer IV?
Water: 30ml/kg/day
Na/K/Cl: 1mmol/kg/day each
What vitamins are essential and what do they cause if there is a deficiency?
In tiny quantities
- A: Xerophthalmia (dry eye)
- D: Rickets
- E: Neurological abnormalities
- K: Defective blood clotting
What is hypervitaminosis?
Intake of too much vitamins
Usually due to supplements