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Hoping to lose a couple extra pounds before spring break? Still deciding which diet will get you into that size-zero bikini the fastest? A group of Harvard researchers just released the results of a comprehensive study of four different weight loss methods, which was conducted over a two-year period and involved 800 participants. So which one worked the best?

They were all pretty much the same. The only thing that seemed to matter was that participants reduce their intake of calories, not whether they elected to follow a low-carb Atkins diet, a low-rat regimen a la Dr. Dean Ornish, or they cut meat out of their diets entirely:

"After two years, every diet group had lost—and regained—about the same amount of weight regardless of what diet had been assigned. Participants lost an average of 13 pounds at six months and had maintained about 9 pounds of weight loss and a two-inch drop in waist size after two years."

Oh well. Guess you can now pick your diet based on which one is the cheapest. Or which one has the more appealing spokesperson. Or something.

Study Zeroes In on Calories, Not Diet, for Loss [NYT]