Manifestations of Calcium Malnutrition Ken-Won Miller Howard University Nutrition Care Management 1 Dr. Castor
Transcript
1. Ken-Won MillerHoward UniversityNutrition Care Management
1Dr. Castor
2. Introduction This presentation will focus mainly on the role
of calcium intake and the manifestations of calcium
deficiencies.
3. Nutrients Nutrients are essential and all play a key role to
survival of the human organism. Water Energy yielding nutrients
Carbohydrates, Protein, Lipids (Fat) Vitamins (organic) Fat
soluble, Water soluble Minerals (inorganic) Macro, Trace
5. What is Calcium Calcium is the most abundant mineral in the
body This mineral is naturally found in foods, added to some,
available as a dietary supplement, and present in some medicines
Most of the bodys calcium is found in bones and teeth. Estimated to
be 99% of calcium in the body Approx 1.5-2% of the body weight An
adequate intake helps grow a healthy skeleton in early life and
minimize bone loss later in life
6. Calcium in Bones Calcium salts form crystals called
hydroxyapatite on a matrix of the protein collagen. Mineralization
of calcium, phosphorus, and other minerals crystallize and harden
the bones. The bones gain strength and rigidity as they
harden.
7. Calcium in Bones Bones are not like solid rock Bones gain
and lose minerals continuously in an ongoing process of remodeling.
The balance between bone resorption and deposition changes with
aging. The lack of homeostasis can lead to manifestations of
clinical problems and cause a disease state.
8. Calcium in Body Fluids %1 of the bodys calcium circulates in
the fluid as ionized calcium that is vital to life. The serum
calcium is highly regulated and doesnt fluctuate with variations in
dietary intakes Calcium also activates a protein called calmodulin
Calmodulin (a inactive protein) is activated by calcium It then
becomes a messenger that tells other proteins what to do and serves
as an interpreter for hormone and nerve mediated messages arriving
at cells
9. Calcium in Body Fluids vascular contraction and
vasodilatation muscle function nerve transmission intracellular
signaling hormonal secretion Role in maintaining normal blood
pressure
10. Recommended Dietary Allowance (RDA): RDAs for the amounts
of calcium required for bone health and to maintain adequate rates
of calcium retention in healthy people. Table 1: Recommended
Dietary Allowances (RDAs) for Calcium [1] Age Male Female Pregnant
Lactating 06 200 mg 200 mg months* 712 260 mg 260 mg months* 13
years 700 mg 700 mg 48 years 1,000 mg 1,000 mg 913 years 1,300 mg
1,300 mg 1418 years 1,300 mg 1,300 mg 1,300 mg 1,300 mg 1950 years
1,000 mg 1,000 mg 1,000 mg 1,000 mg 5170 years 1,000 mg 1,200 mg
71+ years 1,200 mg 1,200 mg* Adequate Intake (AI)
11. Foods that Contain Calcium Calcium is found in a variety of
foods. Dairy Foods Milk, yogurt, and cheese are the most popular
choice in the US. Leafy Greens Kale, broccoli, and Chinese cabbage
are vegetable source Fish Canned sardines and salmon Most grains
(such as breads, pastas, and unfortified cereals), while not rich
in calcium, add significant amounts of calcium to the diet because
people eat them often in large amounts. Fortified foods Breakfast
cereals, fruit juices, soy(Silk) and rice beverages, and tofu.
12. Medicines that Contain Calcium The two main forms of
calcium in supplements are carbonate and citrate Calcium carbonate
is found in some over-the-counter antacid products, such as Tums
and Rolaids.
13. Calcium Balance Homeostasis of calcium is one of the bodys
most important priorities. Bone tissue is used as a reservoir and a
source of calcium, to maintain constant concentrations of calcium
in muscles, blood, and intercellular fluids. Vitamin D and other
hormones play a essential role as well in balancing levels Three
organs play a key role in calcium levels 1. The intestines 2. Bones
3. Kidneys
14. Calcium Balance Parathormone (Parathyroid hormone) A
hormone from the parathyroid glands that regulates blood calcium by
raising it when levels fall too low Calcitonin A hormone from the
thyroid gland that regulates blood calcium by lowering it when
levels rise too high
15.
16. Absorption of Calcium Calcium is absorbed by all parts of
the small intestineTwo mechanisms of absorption Active transport
and passive diffusionIt is best absorbed in an acidic mediumLactose
and vitamin D enhances calcium absorptionThe efficiency of
absorption decreases as calcium intake increases
17. Likelihood of Deficiency Dietary surveys indicate that many
people do not meet the Adequate Intake for calcium, especially
women Consuming foods to maintain adequate vitamin D status improve
absorption Dietary inadequacy is not likely if protein and calcium
intake are adequate Stimulants in coffee and tea can discreetly
increase calcium excretion and reduce absorption in the GI tract
Phytic acid found in whole-grain breads can decrease
availability
18. Lab Values for Nutritional Assessment The normal levels for
ionized (free) Ca2+ 4.64-5.28 mg/dL The normal levels for total
serum Ca2+ (bound and unbound) 8.6-10 mg/dL Status is related to
many factors, including vit D, vit K, phosphate, parathyroid
function, and medications
19. Lab Values for Nutritional Assessment Hypercalcemia (High
Calcium Levels) Associated with endocrine disorders, malignancy,
and hypervitaminosis D Hypocalcemia (Low Calcium Levels) Associated
with Vit D deficiency and inadequate hepatic or renal activation of
Vit D, hypoparathyroidism, magnesium deficiency, renal failure, and
nephrotic syndrome
20. Hypoparathyroidism Hypoparathyroidism is the result of a
decrease in production of parathyroid hormones by the parathyroid
glands located behind the thyroid glands in the neck. Usually
occurs after a surgery where the parathyroid glands are removed.
The result is a low level of calcium in the blood or
hypocalcemia.
21. Assessment Tools Dual-Energy X-ray absorptiometry (DXA) is
thought to be one of the best tools for assessing bone mineral
density Very important in early detection, treatment, and
monitoring of osteoporosis Preferred approach for measuring BMD
Measures bone mineral content at axial and appendicular sites
Monitors changes over time Low radiation exposure Superior quality
control procedures Computerized tomography (CT) scans measure
variances in tissue density. This method is less precise and
accurate than DXA
22. Osteoporosis (Adult Bone Loss) Disease in which the bones
become porous and fragile due to a loss of minerals Bone strength
is a function of two factors Bone mineral density and bone quality
BMD is determined by peak bone mass and BQ relates to bone
architecture, bone turnover, mineralization, and the accumulation
of damage to the bone Peak in bone mass= late 20s early 30s
23. Classification Primary-not related to other disease Mostly
seen in middle aged females and older men/females Males have
greater bone mass Secondary-identifiable cause other than age or
menopause is present Cushings syndrome, myeloma, hyperthyroidism,
amenorrhea, medicines( thiazide diuretics and heparin)
24. Osteoporosis Leads to a greater risk of fractures Fractures
in the hip, vertebrae, pelvis, humerus, distal forearm Females more
likely to have fractures
25. Five Steps to Optimize Bone Health 1. Maintain a balance
diet rich in calcium and vitamin D.2. Participate in regular,
weight-bearing exercise.3. Practice a healthy lifestyle with no
smoking or excessive alcohol intake4. Talk to health care
professional about bone health5. If indicated, obtain bone mineral
density testing and take medication, if appropriate
26. In conclusion Calcium is the most abundant mineral in the
body and is mostly found in bones and teeth. %1 of the bodys
calcium circulates in the fluid as ionized calcium that is vital to
life and homeostasis Many people become deficient in calcium
especially those suffering from illness and the elderly It is
important for dietitians to thoroughly evaluate patients for
calcium defiency and provide nutritional intervention if
needed.
27. References Chung M, Balk EM, Brendel M, et al. Vitamin D
and Calcium: A Systematic Review of Health Outcomes. Rockville
(MD): Agency for Healthcare Research and Quality (US); 2009 Aug.
(Evidence Reports/Technology Assessments, No. 183.) 1,
Introduction. Available from:
http://www.ncbi.nlm.nih.gov/books/NBK32605/ National Institutes of
Health. Optimal calcium intake. NIH Consensus Statement:
1994;12:1-31. [PubMed abstract] 2 Overview of Calcium." Dietary
Reference Intakes for Calcium and Vitamin D. Washington, DC: The
National Academies Press, 2011. Ross AC, Manson JE, Abrams SA,
Aloia JF, Brannon PM, Clinton SK, Durazo-Arvizu RA, Gallagher JC,
Gallo RL, Jones G, Kovacs CS, Mayne ST, Rosen CJ, Shapses SA.
Clarification of DRIs for calcium and vitamin D across age groups.
J Am Diet Assoc. 2011 Oct;111(10):1467. [PubMed abstract] U.S.
Department of Agriculture, Agricultural Research Service. 2011.
USDA National Nutrient Database for Standard Reference, Release 24.
Nutrient Data Laboratory Home
Page,http://www.ars.usda.gov/ba/bhnrc/ndl.