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Low-carb, higher-fat diets add no arterial health risks to obese people seeking to lose weight
Date:5/31/2011

without an excessive amount of body fat.

Among the researchers' other key study findings, to be presented separately at the conference, was that consuming an extremely high-fat McDonald's breakfast meal, consisting of two English muffin sandwiches, one with egg and another with sausage, along with hash browns and a decaffeinated beverage, had no immediate or short-term impact on vascular health. Study participants' blood vessels were actually less stiff when tested four hours after the meal, while endothelial or blood vessel lining function remained normal.

Researchers added the McDonald's meal challenge immediately before the start of the six-month investigation to separate any immediate vascular effects from those to be observed in the longer study. They also wanted to see what happened when people ate a higher amount of fat in a single meal than recommended in national guidelines. Previous research had suggested that such a meal was harmful, but its negative findings could not be confirmed in the Johns Hopkins' analysis. The same meal challenge will be repeated at the end of the study, when it is expected that its participants will still have lost considerable weight, despite having eaten more than the recommended amount of fat.

"Even consuming a high-fat meal now and then does not seem to cause any immediate harm to the blood vessels," says Stewart. However, he strongly cautions against eating too many such meals because of their high salt and caloric content. He says this single meal -- at over 900 calories and 50 grams of fat -- is at least half the maximum daily fat intake recommended by the American Heart Association and nearly half the recommended average daily intake of about 2,000 calories for most adults.

All study participants were between the age of 30 and 65, and healthy, aside from being overweight or obese. Researchers say that in the first study, because people were monitored for the period they lost the s
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Contact: David March
dmarch1@jhmi.edu
410-955-1534
Johns Hopkins Medical Institutions
Source:Eurekalert

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