Magnesium revision - week 11

Question 1

Food source

Answer 1

wheat bran
green vege
nuts
chocolate

Question 2

absorption

Answer 2

• SI by active and passive transport
• 40-60% absorbed up to 80% when intake is low
• supplement form – generally poor absorption
• high fibre intake lowers absorption: phytate binds magnesium

Question 3

storage

Answer 3

50% in bone - calcium-hydroxyapatite mineral

33% in muscle and soft tissue

Question 4

excretion

Answer 4

• Via urine: kidney monitor levels: reduce excretion if intake is low
• High calc (>2600mg) and high sodium intake enhance mag excretion

Question 5

Main function

Answer 5

• Bone formation
• Aids enzyme function
• Aids nerve and heart function

Question 6

RDI

Answer 6

men - 400mg

women - 310mg

Question 7

UL

Answer 7

350mg (only from supplementation)

Question 8

toxicity

Answer 8

diarrhea
weakness
nausea and malaise in people with kidney

Question 9

deficency

Answer 9

weakness
muscle pain
poor heart function
seizures
from supplements - long term diarrhea and vomitting