Atkins, Dukan, Paleo, South Beach, or Zone? They can all work, as long as you stick with them. Many studies have been conducted to try to determine which diet is best for losing weight. Overall, the results of these studies have been inconsistent, say the authors of a paper recently published in JAMA, a leading medical journal. It doesn’t really matter, though, because the differences in amount of weight lost with the different diets is relatively small (usually a couple of pounds). The only...