NUT - Wk 12 Flashcards
What mineral in the body is present in the largest amounts?
calcium
what is the RDA for calcium for everyone 19-50 of age
1000 mg/day
what is the RDA for calcium during menopause
increases to 1200 mg/day
RDA increases for everyone at 70 years of age to ?
1200 mg/day to counteract reduced absorption
the tolerable upper intake for adults younger than 51 is ? and ? for those 51 and older
2500 mg/day
2000 mg/day
What products usually contribute the most to dietary calcium intake as these products are high in bioavailable calcium
dairy products
What compromises the bioavailability of calcium in foods like spinach, collard greens, sweet potatoes, and beans?
oxalic acid
What compromises the bioavailability of calcium in whole grains and nuts
phytic acid
What are the 3 levels of calcium balance?
- intake-absorption-excretion balance
- bone-blood balance
- calcium-phosphorus blood serum balance
in general, ? of ingested calcium is absorbed
25%
calcium requires an ? for absorption, so most of the absorption occurs in the ? where stomach acid has bot been fully buffered
acidic environment
duodenum
what is necessary for the active transport of calcium?
vitamin D
What controls the synthesis of a calcium-binding protein that carries calcium across the intestinal epithelium?
Calcitriol
what can bind to calcium and reduce absorption?
fiber and other binding agents (oxalic and phytic acids)
Most dietary calcium remains unabsorbed and is eliminated in ?
feces
what is the major site of calcium storage containing 99% of body calcium?
bone
calcium has a reciprocal relationship with ?
phosphorus
calcium and phosphorus have a reciprocal relationship where any situation that increases serum phosphorus will decrease what?
serum calcium
What is the baseline RDA for protein intake?
0.8 g/kg body weight
