Among 3,530 Framingham Offspring participants free of heart disease, those in the lowest quartile of serum magnesium were almost 50% more likely to develop atrial fibrillation over 20 years, at 9.4 versus 6.3 cases per 1,000 person-years.
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Minerals
Calcium, iron, magnesium, selenium, zinc and other minerals in the diet.
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Minerals
Zinc supplement helps hepatitis C
A Japanese trial in the Journal of Clinical Biochemistry and Nutrition found chronic hepatitis C patients who took zinc for seven years had an 89% lower risk of liver cancer than non-users, along with improved liver enzymes and higher platelet counts.
Minerals
Zinc oxide found toxic - study
Italian researchers compared zinc oxide and titanium dioxide nanoparticles in Caco-2 cells and found only zinc oxide produced significant cytotoxicity, they report in Nanotoxicology. Both nanoparticles are used in some foods and dietary supplements.
Minerals
Lower magnesium intake means higher hypertension risk
Among 180 adults aged 30 to 59 in Chidambaram, India, those with blood pressure at or above 140/90 excreted significantly less magnesium relative to creatinine than those without hypertension, a Journal of Hypertension study found. Sodium excretion did not differ between the groups.
Minerals
Daily Multivitamin Reduces Cancer Risk
Robert G. Smith reports that a study of about 15,000 male doctors over 50 found 8 percent fewer cancer diagnoses over 11 years among those taking a daily multivitamin. No single cancer type showed a significant drop; he estimates the reduction could equate to 48,000 US lives a year.
Minerals
Selenium supplements may reduce breast cancer death risk
Researchers followed 3,146 Swedish women with invasive breast cancer for 28,172 person-years and found those with the highest dietary selenium intake were 31 percent less likely to die of the disease. The apparent effect was strongest among women who had ever smoked.
Minerals
Selenium may prevent prostate cancer
A meta-analysis in the American Journal of Clinical Nutrition pooled twelve studies covering 13,254 participants and 5,007 prostate cancer cases and found sufficient selenium associated with nearly 70 percent lower risk. Three toenail selenium studies showed a 71 percent reduction.
Minerals
Potassium, calcium, magnesium intakes linked to reduced risk of dementia
Following 1,081 Japanese adults aged 60 and over for 17 years, researchers found those with the highest intakes of potassium, calcium and magnesium were 48, 36 and 37 percent less likely to develop dementia of any cause. No link appeared for Alzheimer's disease.
Minerals
Calcium Intake Linked to Heart Attack
Among 23,980 Heidelberg cohort participants followed 11 years, high total calcium intake came with 31 percent lower heart attack risk, while the study ties calcium supplements to increased risk. The findings appear in the June 2012 issue of Heart.
Minerals
This Life-Saving Mineral Found to Actually Increase Senility in Many
Iron carries oxygen and supports cell growth, but the body excretes it poorly, so surplus builds up in tissue where it acts as a potent oxidizer. An animal study found that lowering blood iron returned beta-amyloid and phosphorylated tau to normal levels, pointing to metal ions' role in Alzheimer's.
Minerals
zinc supplements may do more harm than good
Indian researchers report that liver cells exposed to 14 to 20 micrograms per mL of zinc oxide nanoparticles for 12 hours died more often than unexposed cells, through apoptosis and oxidative-stress-mediated DNA damage. Zinc oxide is used in multivitamins and as a food fortifier.
Minerals
Iodine is Important but a New Study Shows Too Much Causes Problems
Mercola reports that taking too much iodine has been linked to subclinical hypothyroidism, which may raise heart risk, and urges caution with supplements even as U.S. iodine levels appear to be falling. He points to toxin-free sea vegetables and spirulina as dietary sources.
Minerals
Nine in 10 U.S. adults get too much sodium every day
A CDC Vital Signs report finds 10 food types, led by breads and rolls, deli meat and pizza, supply more than 40 percent of Americans' sodium. Average intake runs about 3,300 mg a day against a recommended 2,300 mg limit, and 65 percent comes from store-bought food.
Minerals
Study evaluates blood potassium levels after heart attack and risk of in-hospital mortality (PR)
Heart attack patients whose blood potassium stayed between 3.5 and under 4.5 mEq/L had a lower risk of dying in hospital than those above or below that range, a JAMA study found — a range lower than the 4.0 to 5.0 mEq/L that guidelines recommend.
Minerals
Population-wide salt reduction may do more harm than good
A meta-analysis of 167 studies found a low-salt diet lowered blood pressure by 3.5 mmHg in people with hypertension and under 1 mmHg in others, while raising renin, aldosterone, adrenaline, noradrenaline, cholesterol and triglycerides.
Minerals
Usual Sodium Intakes Compared with Current Dietary Guidelines --- United States, 2005--2008
Using NHANES data from 2005 to 2008, CDC found 47.6 percent of Americans aged 2 and over meet the criteria to hold sodium to 1,500 mg a day, and 98.6 percent of them exceed it. Among the rest, 88.2 percent took in more than the 2,300 mg limit.
Minerals
Zinc's role in the brain (PR)
Xiao-an Zhang and colleagues built a molecule, ZX1, that binds zinc as it leaves synaptic vesicles, letting them watch hippocampal neurons deprived of it. Removing zinc interfered with long-term potentiation, the strengthening of connections thought to underpin memory and learning.
Minerals
Zinc regulates communication between brain cells
Duke and MIT researchers watched zinc regulate signaling between neurons in the hippocampus, a role that may bear on memory formation and epileptic seizures. Senior author James McNamara urges caution with over-the-counter zinc supplements until more is known.
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