Do Salty Foods Make Us Hungrier?
If you ever downed a high-sodium meal at your favorite restaurant on a Saturday evening out, and then had to reach for a big glass of water (or two) during the night, you may think foods high in salt increase thirst. However, according to a long-term study, salty foods actually decrease thirst—by increasing fluid retention—and boost hunger—by increasing the need for energy.
Research has shown that a high-sodium diet increases urine output. While this was believed to be the result of a higher fluid intake, results of this new study suggest that may not be the case. The study was conducted by an international team of scientists simulating a trip to Mars—a scenario in which the connection between salt intake and drinking could be very important. Two groups of 10 healthy, male volunteers participated in the study—one group was observed for 105 days, the other for more than 205 days. Participants received an identical diet, except they were given three different levels of salt in their food for a period of several weeks.
Results showed that a high-sodium diet caused the men in the study to drink less by triggering a process in the kidneys to conserve fluid. That is, excess salt was removed in the urine while fluid moved back into the kidneys and body. The salty diet also caused the men to feel hungrier—perhaps because of a substance called urea that is formed in the muscles and liver to help the body shed nitrogen. According to researchers, synthesizing urea requires a significant amount of energy.
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Sourced from: ScienceDaily
Study Links Hot Flashes in Younger Women to Heart Disease Risk
Hot flashes—which occur in more than 70 percent women in their later reproductive years, as they near menopause—may indicate a higher risk for heart disease, according to a recent study. The research, which was published in the journal Menopause, examined the association between hot flashes and the function of the endothelium—a layer of cells that line the blood vessels. Endothelial function is considered an important factor in predicting cardiovascular disease—specifically atherosclerosis, or hardening of the arteries—risk.
The study involved 272 women between the ages of 40 and 60. The women were non-smokers with no history of heart disease and reported either not experiencing hot flashes or having them daily. Over the course of the study, the women were evaluated for physiologic signs of hot flashes and kept a diary of hot flash symptoms. They underwent blood tests and arterial ultrasounds to measure endothelial function.
According to researchers, women between the ages of 40 and 53 who experienced hot flashes were at increased risk for vascular dysfunction associated with heart disease. However, the study did not show a correlation between hot flashes and heart disease risk in women between 54 and 60 years of age.
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Sourced from: MNT
Simple Blood Test Can Rule Out Heart Attack
A new blood test—approved by the FDA in January, but not yet available in the United States—can help rule out acute myocardial infarction, or heart attack, in people who are experiencing chest pain. These simple tests, called high-sensitivity cardiac troponin T (hs-TnT or hs-cTnT) blood tests for the rapid diagnosis of acute myocardial infarction, could revolutionize heart attack diagnosis and treatment—especially in hospital emergency departments.
A new meta-analysis published in the Annals of Internal Medicine suggests the test is highly effective. The analysis evaluated 11 studies involving 9,241 emergency room patients complaining of chest pain. Of these patients, 30 percent were classified as low-risk for heart attack because they had no new ischemia on ECG and had hs-TnT measurements below 0.005 μg/L. According to researchers, only 14 patients in this low-risk group had an acute myocardial infarction within the next 30 days.
Troponin may not be detectable in the first hours following a heart attack. The test should be used with caution within the first few hours of symptom onset and repeated after three hours. When the test becomes available in the U.S., it will likely be used in combination with existing protocols for diagnosing heart attack.
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Sourced from: Med Page Today