July 29th, 2011 by PJSkerrett in Health Tips
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The brutal heat wave gripping much of the country this week is unpleasant for healthy folks. For people with cardiovascular trouble, hazy, hot, humid days can be downright dangerous.
Your body shouldn’t get too hot (or too cold). If your temperature rises too far, the proteins that build your body and run virtually all of its chemical processes can stop working. The human body sheds extra heat in two ways, both of which stress the heart:
Radiation. Like water flowing downhill, heat naturally moves from warm areas to cooler ones. As long as the air around you is cooler than your body, you radiate heat to the air. But this transfer stops when the air temperature approaches body temperature.
Radiation requires rerouting blood flow so more of it goes to the skin. This makes the heart beat faster and pump harder. On a hot day, it may circulate two to four times as much blood each minute as it does on a cool day.
Evaporation. Read more »
*This blog post was originally published at Harvard Health Blog*
July 3rd, 2011 by John Mandrola, M.D. in Health Tips
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The Biology of Omega-3 fatty acids: (Just a little science:)
When fish, flax-seeds or Brussels sprouts pass through the intestine, pancreatic enzymes transform the fat to free fatty acids. These acids are quickly taken up by the cells. Once in the cell, these fatty acids enter the mitochondria, endoplasmic reticulum and cytosol–places that you might recall because your mom helped you make a Cell sponge cake in 7th grade Biology.
In the cells, the Omega-3 fatty acids (ALA, DHA and EPA) exert their healthy influence in three major ways:
- in the control of chemical messengers;
- in the flux of ions—cell electricity;
- in the smoothness and health of the cell membrane.
That’s enough about cells.
How do these (good) fats help our bodies?
Omega-3 fatty acids reduce Inflammation:
–Omega-3s get in the cellular (not phone) mix and end up competing with chemicals that cause inflammation—medical people say they antagonize bioactive mediators of inflammation.
–Newly-discovered by-products of Omega-3s are important in the resolution phase of inflammation. Biochem people call these chemicals, resolvins. All you have to remember here is this: to resolve (inflammation) is heart-healthy.
–When omega-3s are incorporated into the membranes of cells they do a lot of good: things like making the membrane more fluid and less sticky. For some reason, they even block genes that induce hardening of the arteries. (Genomic effects.)
Omega-3s benefit the heart: They… Read more »
*This blog post was originally published at Dr John M*
June 23rd, 2011 by Glenn Laffel, M.D., Ph.D. in Opinion
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We have all seen people exhibit flagrantly unhealthy behavior. Some of us–though we’d never admit it–derive a certain, smug satisfaction by observing them. At least I don’t do that!
Somewhere in the course of our daily lives though, most of us do exhibit behavior that suggests at least some disregard for our health. We don’t change our diet, though we know we should. We don’t floss, take medications as prescribed, or get the screening tests we’re supposed to.
Multiple intertwining causes underlie all unhealthy behavior, of course. I had always figured that one pervasive cause was the lack of a simple, observable connection between health-related behaviors and health outcomes. There is a long delay for example, between establishing unhealthy dietary preferences and the sequellae of that behavior (a heart attack, diabetes or whatever). The longer the delay between cause and effect, the more likely someone will be to exhibit unhealthy behavior.
On the other hand, if there’s a short interval between cause and effect—it only takes minutes for susceptible people to develop a severe allergic reaction after eating peanuts, for example—well, that’s where I’d expect high adherence to the required healthy behavior.
If I’m right, then we have a problem. For many chronic diseases (diabetes, heart disease, some cancers) Read more »
*This blog post was originally published at Pizaazz*
May 17th, 2011 by Toni Brayer, M.D. in Health Tips, Research
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New information published in Circulation advises against using any nonsteroidal anti-inflammatory drugs (NSAIDs) in patients who have had a prior heart attack. These over-the-counter drugs are commonly used like Advil, Aleeve, Diclofenac, Ibuprofen. Using NSAIDs for even as little as one week was associated with a 45% increase for death or recurrent myocardial infarction (MI). The researchers could not identify a period that seemed to be safe, no matter how short.
The study used the Danish National Patient Registry and identified 83,675 patients who had a first MI between 1997 and 2006. The average age was 68 years and 65% were men. All the NSAIDs (except Naprosyn) used during the observation period were associated with an increased risk for death or new heart attack. Diclofenac (brand name Voltaren) was the worst.
Readers should not go away thinking NSAIDs cause heart attacks. This study looked at patients who had already had an MI. But for those patients, the over-the-counter pain relievers should be avoided. Many patients with heart disease also have arthritis or other pain syndromes. We need to come up with safe treatments for pain or use “safer” NSAIDs like low dose Naprosyn or Ibuprofen only when the benefit is weighed with the risk.
Just because something is sold without a prescription does not mean it is without risk. Tell your doctor every medication you take.
*This blog post was originally published at EverythingHealth*
May 10th, 2011 by admin in Health Tips, Research
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Calcium is good for us, right? Milk products are great sources of calcium, and we’re told to emphasize milk products in our diets. Don’t (or can’t) eat enough dairy? Calcium supplements are very popular, especially among women seeking to minimize their risk of osteoporosis. Osteoporosis prevention and treatment guidelines recommend calcium and vitamin D as an important measure in preserving bone density and reducing the risk of fractures. For those who don’t like dairy products, even products like orange juice and Vitamin Water are fortified with calcium. The general perception seemed to be that calcium consumption was a good thing – the more, the better. Until recently.
In a pattern similar to that I described with folic acid, there’s new safety signals from trials with calcium supplements that are raising concerns. Two studies published in the past two years suggest that calcium supplements are associated with a significantly increased risk of heart attacks. Could the risks of calcium supplements outweigh any benefits they offer? Read more »
*This blog post was originally published at Science-Based Medicine*
