High-Fat Diets Won't Harden Arteries
Selasa, 14 Juni 2011 by Android Blackberry
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| High-Fat Diets Won't Harden Arteries |
Low-carbohydrate diets that demand patients to fill up on fats won't result in harder arteries, researchers say -- a minimum of not inside the short-term.
Those that lost 10 pounds soon after curbing their carb intake had no differences in arterial stiffness than those on a more standard, low-fat diet, Dr. Kerry Stewart of Johns Hopkins and colleagues reported at the American College of Sports Medicine meeting in Denver.
"Losing weight could be extra important to [arterial] health than the diet plan you are on," Stewart told MedPage Currently.
Some researchers have raised concerns that replacing carbs with fats could have adverse effects on blood vessels, especially due to the fact promoting consumption of fats runs "counter to what the public has been told [about decreasing fat intake] for the last 20 or so years," Stewart stated.
But studies have shown that a low-carb diet plan can have positive effects on blood pressure, cholesterol, and other parameters that might lessen the risk of the artery illness atherosclerosis and subsequent heart disease.
So to assess what the diets are truly performing to patients' arteries, Stewart and colleagues enrolled 55 overweight or obese but wholesome patients ages 30 to 65 in a way of life modification program. None had heart disease or other markers of cardiovascular risk at enrollment.
Additionally to a supervised physical exercise program -- an hour-long regimen three days per week -- patients had been randomized to either a low-carb or low-fat diet plan for six months. The researchers monitored arterial stiffness and other measures of blood vessel health.
For this analysis, the researchers had data on 23 of 28 patients who lost 10 pounds on the low-carb diet plan, and 23 of 27 who did so on the traditional diet. Those on the low-carb diet plan lost the 10 pounds sooner than the low-fat group did -- just 45 days as opposed to 70 days.
There were no changes in arterial stiffness or endothelial function in either diet group, and that didn't change soon after the outcomes had been adjusted for the time it took to shed 10 pounds, Stewart said.
"My theory is that if individuals can obtain weight loss, it will benefit vasculature in every single other method of body," he told MedPage Today. "Weight loss, in the lengthy run, will count far more than the distinct content of the diet plan."
Nor had been there any acute effects on vascular function right after a lone high-fat meal, the researchers discovered. In a companion study, 66 patients had no changes in endothelial function after consuming a 900-calorie, 50-grams-of-fat meal from McDonald's. In truth, arterial stiffness considerably improved by 16 percent following that feast, the researchers discovered.
"It truly seemed to create the arteries relax additional, but we're not entirely positive how," Stewart stated. "We'll have to look more deeply into that."
Some researchers contacted for outside comment said longer-term follow up may be necessary to confirm those advantages. And analyses of the diet plan study that consist of the sort of fats eaten would be valuable, they said.
"It would be nice to know what the fat consisted of, as some may perhaps be safer than others -- i.e. monounsaturated fats and omega-3 fatty acids and even polyunsaturated fats could be much better than saturated fats," stated Dr. Carl Lavie of the University of Queensland in New Orleans, who was not involved inside the study.
Stewart stated that upcoming analyses will break down the kind of fats consumed, and that the dieticians involved inside the study advised patients to stick to these healthier fats.
He added that the work must help allay physicians' concerns about recommending a low-carbohydrate diet -- something the medical community has largely been reluctant to do, he stated.
These are some of the nearly 100 news stories covering a brand new study which was presented yesterday at a meeting of the American College of Sports Medicine, which showed that neither of two distinctive weight-loss diets did not negatively effect artery function or enhance stiffening of the arteries, both of which are associated with heart disease.
Certainly, I'm delighted to see low-carb high-fat diets covered in a positive manner. But I've got to admit I'm also puzzled. This diet comparison just isn't yet published in a peer-reviewed journal, it's fairly smaller (55 participants), and though the two diet plan groups were distinctly unique (30% fat, 55% carbs for one group; 40% fat, 30% carbs for the other), they weren't vastly various. (Although even with this moderate-carb approach, the lower-carb group lost weight a lot quicker than the higher-carb group.) 1 or two years ago, a study like this would not have created a ripple on the face of the media. So why all of the hoopla now? I think that it's a sign of the times. All the milestones we've been experiencing over the last decade or so are beginning to have an effect.
I have been accused of becoming a Pollyanna as a result of my general optimism of reduced-carb diets moving towards acceptance in the mainstream. It's certainly been happening much more slowly than I would like - I would even agree with the adjective "glacial" - but glaciers eventually do have their way, and I truly believe that we are getting fairly close to a breakthrough, although I admit I still have my fingers crossed
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