You may have read recently about the study described here, which has been interpreted as showing that the Atkins diet is better than either a Mediterranean or low-fat diet.
Such claims, and the great majority of the media coverage I've seen, are extremely misleading.
First, was this really the Atkins diet that millions have embraced? The low-carb diet in the study "urged dieters to choose vegetarian sources of fat and protein." That's right, vegetarian. Is that what you think of when you think of the Atkins diet?
Second, the "low-fat" diet required dieters to consume at most 30 percent of their calories from fat. Thirty percent!
Getting at most 30 percent of your calories from fat is what has long been recommended by conservative, mainstream organizations (such as the U.S. government, which uses thirty percent for the nutrition information on packaged foods). Thirty percent is only slightly lower than the average for all U.S. adults (some estimates: 33, 34, 34). So 30 percent is hardly low fat. Those who actually follow a low-fat diet see 30 percent as a high fat diet.
Here's some more sensible coverage of the study.