Calcium Flashcards
1
Q
What are the main sources of Calcium in the diet?
A
Cereals and dairy
2
Q
Main sources of Phosphorous in diet?
A
cereals, dairy, meat
3
Q
Current Calcium/day Intake in UK?
A
1007mg/d for men
777mg/d for women
4
Q
What are the factors affecting calcium absorption
A
Vitamin D (increases absorption) Protein ( increases absorption) Fat (decreases absorption) Caffiene (slight decrease) Alcohol (decrease absorption)
5
Q
What is the bioavialability of calcium from various sources
A
Milk products - most bioavailable, approx 30%
Plant sources- phytic and oxalic acid inhibit absorption, spinach is only 5%
Broccoli, sweet potato, kale, bok choy better
Soya is the EXCEPTION very bioavailable - 30-40%
6
Q
Describe calcium absorption
A
Ca2+ - ECaC - enters cell- CaBp- basolateral membrane- enters cell via CaAtpase with exchange of sodium REGULATED BY VITAMIN D
