Incorrect Wording and Data Error: In the Original Contribution entitled “Comparison of the Atkins, Zone, Ornish, and LEARN Diets for Change in Weight and Related Risk Factors Among Overweight Premenopausal Women: The A TO Z Weight Loss Study: A Randomized Trial” published in the March 7, 2007, issue of JAMA (2007;297(9):969-977), a sentence was incorrectly worded in the abstract, and data were reported incorrectly in the text. On page 969, in the “Conclusions” section of the abstract, the first sentence should have read “In this study, premenopausal overweight and obese women assigned to follow the Atkins diet, which had the lowest carbohydrate intake, had lost more weight at 12 months than those assigned to the Zone diet, and had experienced comparable or more favorable metabolic effects than those assigned to follow the Zone, Ornish, or LEARN diets.” On page 972, in the last paragraph, the mean 12-month weight changes for the LEARN and Ornish diets were reversed: for LEARN it should have been −2.6 kg (95% CI, −3.8 to −1.3 kg) and for Ornish it should have been −2.2 kg (95% CI, −3.6 to −0.8 kg).