Illinois Advance Sheet April 2013

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Citizenship and Immigration Services. Over the past several years, USCIS has received a greater number of petitions than there are visa numbers available because the annual cap for H-1B visas does not meet the current demand for high-skilled workers. Table 1. Many opponents of the H-1B visa seek to pit native-born workers against their foreign-born colleagues. In reality, workers do not necessarily compete against each other for a fixed number of jobs.

The United States has created a dynamic and powerful economy. Foreign-born workers of all types and skills, from every corner of the globe, have joined with native-born workers to build it.

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Indeed, H-1B workers positively impact our economy and the employment opportunities of native-born workers. Despite suggestions to the contrary, the overwhelming evidence shows that H-1B workers do not drive down wages of native-born workers, with some studies showing a positive impact on wages overall. Research shows that H-1B workers complement U. The United States faces challenges in meeting the growing needs of an expanding knowledge-based innovation economy.

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Learn more about the Apple study. At the other end of the spectrum, some older women likely exceed the UL when calcium intakes from both food and supplements are included [ 1 ]. Not all calcium consumed is actually absorbed in the gut. Other factors also affect calcium absorption including the following:. Some absorbed calcium is eliminated from the body in urine, feces, and sweat. This amount is affected by such factors as the following:.

Inadequate intakes of dietary calcium from food and supplements produce no obvious symptoms in the short term. Circulating blood levels of calcium are tightly regulated.

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Hypocalcemia results primarily from medical problems or treatments, including renal failure, surgical removal of the stomach, and use of certain medications such as diuretics. Symptoms of hypocalcemia include numbness and tingling in the fingers, muscle cramps, convulsions, lethargy, poor appetite, and abnormal heart rhythms [ 26 ].

If left untreated, calcium deficiency leads to death. Over the long term, inadequate calcium intake causes osteopenia which if untreated can lead to osteoporosis.

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The risk of bone fractures also increases, especially in older individuals [ 1 ]. Calcium deficiency can also cause rickets, though it is more commonly associated with vitamin D deficiency [ 1 ]. Although frank calcium deficiency is uncommon, dietary intakes of the nutrient below recommended levels might have negative health consequences over the long term. The following groups are among those most likely to need extra calcium. Menopause leads to bone loss because decreases in estrogen production both increase bone resorption and decrease calcium absorption [ 13 , 27 , 28 ].

Increased calcium intakes during menopause do not completely offset this bone loss [ 30 , 31 ]. Hormone replacement therapy HRT with estrogen and progesterone helps increase calcium levels and prevent osteoporosis and fractures. Estrogen therapy restores postmenopausal bone remodeling to the same levels as at premenopause, leading to lower rates of bone loss [ 27 ], perhaps in part by increasing calcium absorption in the gut.

Several medical groups and professional societies support the use of HRT as an option for women who are at increased risk of osteoporosis or fractures [ ]. Such women should discuss this matter with their healthcare providers. In addition, consuming adequate amounts of calcium in the diet might help slow the rate of bone loss in all women.

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Amenorrhea, the condition in which menstrual periods stop or fail to initiate in women of childbearing age, results from reduced circulating estrogen levels that, in turn, have a negative effect on calcium balance. Amenorrheic women with anorexia nervosa have decreased calcium absorption and higher urinary calcium excretion rates, as well as a lower rate of bone formation than healthy women [ 35 ]. The "female athlete triad" refers to the combination of disordered eating, amenorrhea, and osteoporosis.

Exercise-induced amenorrhea generally results in decreased bone mass [ 36 , 37 ]. In female athletes and active women in the military, low bone-mineral density, menstrual irregularities, certain dietary patterns, and a history of prior stress fractures are associated with an increased risk of future stress fractures [ 38 ]. Such women should be advised to consume adequate amounts of calcium and vitamin D. Supplements of these nutrients have been shown to reduce the risk of stress fractures in female Navy recruits during basic training [ 39 ].

Lactose intolerance refers to symptoms such as bloating, flatulence, and diarrhea that occur when one consumes more lactose, the naturally occurring sugar in milk, than the enzyme lactase produced by the small intestine can hydrolyze into its component monosaccharides, glucose and galactose [ 40 ]. The symptoms vary, depending on the amount of lactose consumed, history of consumption of lactose-containing foods, and type of meal. Lactose-intolerant individuals are at risk of calcium inadequacy if they avoid dairy products [ 1 , 41 , 42 ]. Research suggests that most people with lactose intolerance can consume up to 12 grams of lactose, such as that present in 8 ounces of milk, with minimal or no symptoms, especially if consumed with other foods; larger amounts can frequently be consumed if spread over the day and eaten with other foods [ 1 , 41 , 42 ].

Other options to reduce symptoms include eating low-lactose dairy products including aged cheeses such as Cheddar and Swiss , yogurt, or lactose-reduced or lactose-free milk [ 1 , 41 , 42 ]. Some studies have examined whether it is possible to induce adaptation by consuming incremental lactose loads over a period of time [ 44 , 46 ], but the evidence in support of this strategy is inconsistent [ 41 ].

Cow's milk allergy is less common than lactose intolerance, affecting 0. People with this condition are unable to consume any products containing cow's milk proteins and are therefore at higher risk of obtaining insufficient calcium. To ensure adequate calcium intakes, lactose-intolerant individuals and those with cow's milk allergy can choose nondairy food sources of the nutrient such as kale, bok choy, Chinese cabbage, broccoli, collards and fortified foods or take a calcium supplement.

Vegetarians might absorb less calcium than omnivores because they consume more plant products containing oxalic and phytic acids [ 1 ]. Lacto-ovo vegetarians who consume eggs and dairy and nonvegetarians have similar calcium intakes [ 48 , 49 ]. However, vegans, who eat no animal products and ovo-vegetarians who eat eggs but no dairy products , might not obtain sufficient calcium because of their avoidance of dairy foods [ 50 , 51 ]. In the Oxford cohort of the European Prospective Investigation into Cancer and Nutrition, bone fracture risk was similar in meat eaters, fish eaters and vegetarians, but higher in vegans, likely due to their lower mean calcium intake [ 52 ].

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It is difficult to assess the impact of vegetarian diets on calcium status because of the wide variety of eating practices and thus should be considered on a case by case basis. Many claims are made about calcium's potential benefits in health promotion and disease prevention and treatment. This section focuses on several areas in which calcium is or might be involved: bone health and osteoporosis; cardiovascular disease; blood pressure regulation and hypertension; cancers of the colon, rectum, and prostate; kidney stones; and weight management.

Bones increase in size and mass during periods of growth in childhood and adolescence, reaching peak bone mass around age The greater the peak bone mass, the longer one can delay serious bone loss with increasing age.

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Everyone should therefore consume adequate amounts of calcium and vitamin D throughout childhood, adolescence, and early adulthood. Osteoporosis, a disorder characterized by porous and fragile bones, is a serious public health problem for more than 10 million U. Another 34 million have osteopenia, or low bone mass, which precedes osteoporosis. Osteoporosis is most associated with fractures of the hip, vertebrae, wrist, pelvis, ribs, and other bones [ 53 ].

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An estimated 1. When calcium intake is low or ingested calcium is poorly absorbed, bone breakdown occurs as the body uses its stored calcium to maintain normal biological functions. Bone loss also occurs as part of the normal aging process, particularly in postmenopausal women due to decreased amounts of estrogen. Many factors increase the risk of developing osteoporosis, including being female, thin, inactive, or of advanced age; smoking cigarettes; drinking excessive amounts of alcohol; and having a family history of osteoporosis [ 55 ].

Various bone mineral density BMD tests are available. A T-score of Although osteoporosis affects individuals of all races, ethnicities, and both genders, women are at highest risk because their skeletons are smaller than those of men and because of the accelerated bone loss that accompanies menopause. Regular exercise and adequate intakes of calcium and vitamin D are critical to the development and maintenance of healthy bones throughout the life cycle. Both weight-bearing exercises such as walking, running, and activities where one's feet leave and hit the ground and work against gravity and resistance exercises such as calisthenics and that involve weights support bone health.

Supplementation with calcium plus vitamin D has been shown to be effective in reducing fractures and falls which can cause fractures in institutionalized older adults [ 57 ]. However, among community-dwelling older adults over age 50, the benefits of supplementation with these nutrients on fracture resistance are much less clear. A recent systematic review of 26 randomized controlled trials found that calcium supplements, with or without vitamin D, modestly but significantly reduced the risk of total and vertebral fractures, but not fractures of the hip or forearm [ 58 ].

But the four trials with the lowest risk of bias, involving a total of 44, individuals, showed no effect of supplementation on risk of fracture at any site. A related meta-analysis of calcium intake on bone mineral density found that calcium supplementation produced only a small, initial, and non-progressive increase in bone mineral density that was unlikely to result in a clinically significant reduction in the risk of bone fractures [ 59 ]. Preventive Services Task Force USPSTF concluded that the current evidence is insufficient to assess the balance of benefits and harms of combined vitamin D and calcium supplementation to prevent bone fractures in premenopausal women or in men [ 60 ].

In , the FDA authorized a health claim related to calcium and osteoporosis for foods and supplements [ 61 ]. In January , this health claim was expanded to include vitamin D. Model health claims include the following: "Adequate calcium throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis" and "Adequate calcium and vitamin D as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life" [ 61 ].

Data from observational and experimental studies on the potential role of calcium in preventing colorectal cancer, though somewhat inconsistent, are highly suggestive of a protective effect [ 1 ].

Illinois Advance Sheet April 2013 Illinois Advance Sheet April 2013
Illinois Advance Sheet April 2013 Illinois Advance Sheet April 2013
Illinois Advance Sheet April 2013 Illinois Advance Sheet April 2013
Illinois Advance Sheet April 2013 Illinois Advance Sheet April 2013
Illinois Advance Sheet April 2013 Illinois Advance Sheet April 2013

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