8b. Vitamins - Water Soluble Flashcards
What is the alternative name for vit B1?
Thiamine
What is the active form of B1?
Thiamine pyrophosphate
What mineral is needed to convert B1 to thiamine pyrophosphate?
Magnesium
What impairs the conversion of B1 to thiamine pyrophosphate?
Alcohol
How long can B1 stores in the body last?
1 month
What can easily reduce B1 content in food?
Processing - milling, chopping, canning, adding sulphites, baking soda
What percentage of B1 content is reduced by boiling/freezing?
50%
What percentage of B1 is lost during toasting?
30%
Examples of B1 food sources
Wholegrains
Nuts
Seeds
Yeast extract
What are the main functions of B1?
Energy production
Nervous system functioning
What are the functions of B1 in energy production?
Carb, fat, protein metabolism
Formation of acetyl-CoA
What are the functions of B1 in nervous system functioning?
Acetyl-CoA is a precursor to acetylcholine
Neurotransmitters e.g. GABA are created by amino acids metabolised by B1
What are the therapeutic uses of B1 in energy production?
Fatigue
Supporting energy production in increased need
Fertility
What are the therapeutic uses of B1 in nervous system functioning?
Cognitive decline/memory loss Alzheimer's Parkinson's Nerve repair Low mood
What can impair B1 absorption?
Alcohol Tea Coffee OCP Stress Antacids
What are the signs/symptoms of B1 deficiency?
Fatigue Muscle weakness GIT disturbance Depression Irritability Beri beri
What is B2 also known as?
Riboflavin
What colour is B2?
Florescent green/yellow
What can reduce the food content of B2?
Light
Heating/boiling
Freezing
Examples of B2 food sources
Wholegrains Nuts Seeds Yeast extract Spinach Eggs
What are the functions of B2?
Energy production
Liver detoxification
Iron metabolism
What are the functions of B2 in energy production?
Carbs, fats, protein metabolism
Krebs cycle
Beta-oxidation
Constituent of FAD and FMN energy carriers
What are the functions of B2 in liver detoxification?
Phase 1 liver detoxification via CYP450 enzymes
Regeneration of glutathione
What are the functions of B2 in iron metabolism?
Main requirement for Fe metabolism
What are the therapeutic uses of B2 in energy production?
Fatigue
Migraines
Stress
What are the therapeutic uses of B2 in liver detoxification?
Liver detoxification programmes
What are the therapeutic uses of B2 in iron metabolism?
Anaemia
What helps increase intestinal absorption of B2?
Bile salts
What decreases bioavailability and absorption of B2?
Alcohol Antacids Caffeine Copper Zinc Theophylline (choc) Saccharin
What can reduce B2 levels in the body?
Smoking
Heavy exercise
Pregnancy
Ageing
What are the signs/symptoms of B2 deficiency?
Fatigue Weakness Poor concentration Depression Sores at mouth corners Red, dry atrophic tongue Scaly dermatitis
What is the alternative name for B3?
Niacin
What are the B3 vitamers?
Nicotinic acid
Nicotinamide
What are the active forms of B3?
Nicotinamide adenine dinucleotide (NAD)
Nicotinamide adenine dinucleotide phosphate (NADP)
How is B3 synthesised in the body?
From tryptophan
How much tryptophan produces 1mg of B3?
60mg
Examples of B3 food sources
Nuts Seeds Yeast extract Spinach Eggs Meat Fish
What reduces B3 in foods?
Cooking
What are the co-factors that B3 needs to be synthesised?
B2
B6
Iron
What is niacin flush?
Skin flush and itch due to supplementation
How can you try to avoid niacin flush?
Initial dose of 25mg
Then gradually increase
Take with 1g vit C
Where is B3 mostly stored?
Liver
Heart
Muscles
Kidneys
Where is B3 absorbed?
Small intestine
What are the functions of B3?
Energy production
Cardiovascular
Insulin
What are the functions of B3 in energy production?
Glycolysis
Acetyl-CoA formation
Krebs Cycle
Fatty acid oxidation
What are the functions of B3 in CV health?
Lowers secretion of LDL
Vasodilatory (lowers BP)
What are the functions of B3 in insulin?
Glucose-tolerance factor (GTF) which plays an important role in insulin response uses B3
What are the therapeutic uses of B3 in energy production?
Fatigue
Supporting energy production in increased need
Alzheimer’s
What are the therapeutic uses of B3 in CV health?
CV disease
Hyperlipidaemia
What are the therapeutic uses of B3 in insulin?
Diabetes 2 and 1
PCOS
What are the signs/symptoms of B3 mild deficiency?
Fatigue Vomiting Depression Indigestion Mouth ulcers Sensitivity to strong light Red tongue
What are the signs/symptoms of B3 severe deficiency?
Pellagra: Diarrhoea Dermatitis Dementia Death
What conditions can occur with high levels of B3?
Hypotension
Hypothyroidism
Flush
Hepatotoxicity
Why can B3 supplementation worsen gout?
B3 competes with urate for excretion
What is the alternative name for B5?
Pantothenic acid
Examples of B5 food sources
Nuts Seeds Avocados Shiitake mushrooms Meat Fish
How is B5 made?
By intestinal bacteria
What could reduce the synthesis of B5?
Antibiotics
What percentage of B5 is lost during processing, cooking and freezing?
Up to 80%
What are the functions of B5?
Energy production
Fat metabolism
Stress hormones
Antihistamine
What are the functions of B5 in energy production?
Carb and protein metabolism
Acetyl-CoA production
What are the functions of B5 in fat metabolism?
Synthesis of fatty acids
Degradation of fatty acids
What are the functions of B5 in stress hormones?
Acetyl-CoA makes neurotransmitters
Co-factor for stress hormones
(so used up quickly when stressed)
What are the therapeutic uses of B5 in energy production?
Fatigue
Supporting energy production in increased need
What are the therapeutic uses of B5 in fat metabolism?
Acne vulgaris
What are the therapeutic uses of B5 in stress hormones?
Adrenal fatigue
PMS
Stress
Hormonal dysfunction
What are the therapeutic uses of B5 in antihistamines?
Allergies
Hay fever
In what situations is there an increased need for B5?
Antibiotics
Alcoholics
Prolonged stress
Recent surgery
What are the deficiency signs/symptoms of B5?
Fatigue
Burning sensation in feet
Tender heals
Abdominal distress
What is the alternative name for B6?
Pyridoxine