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HealthDay News reports that a new study funded by the National Institutes for Health finds that high-fat, low-carbohydrate diets like the famed Atkins plan is tougher on the heart than the Ornish and South Beach diets.

According to the story, “researchers evaluated cholesterol levels and other cardiac risk factors. They also looked at three-day food records at the end of each diet phase. And they checked blood vessel functioning by measuring blood vessel dilation in the arm.” And what they found was that high fat diets reduce blood vessel flow, which is unhealthy.

Officials with the Atkins plan criticized the study, saying that the sample was too small and the results too imprecise to be taken seriously.
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