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How do phytates,tannins,and oxalates affect the absorption of minerals?

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Phytates,tannins,and oxalates ...

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Compared to the non-pregnant state,the magnesium requirement for pregnancy is increased but there is no further increase during lactation.Why is this the case?


A) There is no increased need for magnesium during lactation because the infant is born with sufficient magnesium stores.
B) Any additional needs are met by magnesium release during bone resorption and decreased urinary excretion.
C) Magnesium absorption is increased during lactation.
D) Breast milk does not contain a lot of magnesium.

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Which of the following has been the most effective in decreasing post-menopausal bone loss?


A) fluoride treatment
B) hormone replacement therapy
C) increasing vitamin C consumption
D) vitamin A replacement therapy

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Which statement best describes the structure of bone?


A) The organic component is a protein framework and the mineral component is a calcium chloride crystal.
B) The organic matrix is composed of collagen and the mineral component is an hydroxyapatite crystal composed mainly of calcium and phosphorus.
C) The organic component is a hydroxyapatite compound and the mineral component is composed mainly of calcium and phosphorus,as well as small amounts of magnesium,sodium and fluoride.
D) The organic component is made mainly of the protein collagen and the mineral component is mainly calcium and magnesium.

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The level of calcium in the blood is maintained within a narrow limit by two hormones.Which one raises blood calcium? Which one lowers blood calcium?


A) raises: calcitonin;lowers: aldosterone
B) raises: calcitonin;lowers: parathyroid hormone
C) raises: parathyroid hormone;lowers: calcitonin
D) raises: thyroid stimulating hormone;lowers: calcitonin

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How do the phosphorus content of oranges,yogurt,and chicken compare? Which is the BEST source of phosphorus? How do the phosphorus content of oranges,yogurt,and chicken compare? Which is the BEST source of phosphorus?

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Yogurt is an excellent source of phospho...

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What are good dietary sources of calcium? phosphorus? magnesium?

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Calcium: Yogurt,milk,cheese,sardines,and...

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Which of the following compounds has NOT been found to interfere with absorption of a mineral needed by the body?


A) glutathione
B) oxalates
C) phytates
D) tannins

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Which of the following does NOT decrease the bioavailability of calcium?


A) tannins
B) fibre
C) oxalates
D) starch

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D

What is a consequence of replacing 250 ml (1 cup) of milk with 355 ml of a soft drink?


A) It decreases the amount of added sugar in the diet.
B) It increases the amount of protein in the diet.
C) It reduces calcium,vitamin A,vitamin D,and riboflavin intake.
D) All of the above answer choices are correct.

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Which statement about the processing of foods is TRUE?


A) Processing destroys minerals.
B) The processing of grains causes the loss of magnesium,selenium,and zinc.
C) As the structure of foods is broken down,sodium is lost from processed foods.
D) Potassium is often added during food processing.

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What stimulates the secretion of parathyroid hormone? What are the specific actions of this hormone? What stimulates the secretion of parathyroid hormone? What are the specific actions of this hormone?

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PTH is secreted in response to low blood...

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Which is NOT a characteristic of the milk-alkali syndrome?


A) excessive use of calcium containing antacids.
B) high blood calcium.
C) the consumption of sweetened soft drinks.
D) calcification of the kidney leading to kidney failure.

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Which statement about mineral supplements is FALSE?


A) Supplements can be toxic.
B) Supplements of one mineral can compromise the bioavailability of other minerals.
C) Supplements can help individuals meet their dietary needs.
D) Supplements should always be avoided.

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Bisphosphonates treat osteoporosis by what mechanism?


A) mimicking the action of estrogen.
B) inhibiting the action of osteoclasts.
C) encouraging weight gain.
D) providing more energy for exercise.

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Helen is 53-years-old,her daughter,Sharon,is 27-years-old and her granddaughter,Mikayla,is 5. a)What is the probable status of bone density in each of the three females? b)What are lifestyle risk factors associated with osteoporosis? c)What can each of the three females do to decrease the risk of osteoporosis in their lifetimes?

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a)Helen is probably suffering age-relate...

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Which of the following is the major reason why women are at increased risk of osteoporosis,compared to men?


A) Women achieve a higher peak bone mass than men.
B) Bone breakdown is accelerated for a few years post-menopause.
C) Women experience higher rates of sacropenia.
D) Family history influences risk more in women than men.

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B

When is calcium absorption highest?


A) in infancy.
B) in young adults.
C) in older adults.
D) in women after menopause.

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Which statement best describes the relationship between bone health and calcium consumption? Note: fracture threshold = bone density that is so low that bones will break readily


A) The accretion of calcium into bone occurs until early adulthood after which bone mass gradually declines.The greater the peak bone mass,the younger the age at which an individual reaches the fracture threshold.
B) The accumulation of calcium into bone occurs until early adulthood after which bone mass does not change.The exception of women,who experience a rapid decline in bone mass for the first five years after menopause.
C) The accumulation of calcium into bone occurs until early adulthood,after which bone mass does not change The lower the peak bone mass,the younger the age at which an individual reaches the fracture threshold.
D) The accretion of calcium into bone occurs until early adulthood after which bone mass gradually declines.The greater the peak bone mass,the older the age at which an individual reaches the fracture threshold.

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D

Which of the following does NOT reduce the risk of osteoporosis?


A) weight-bearing exercise.
B) very low body weight.
C) increased muscle mass.
D) high body weight and % body fat.

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