Sixteen low-sugar peach nectar samples were prepared with 60% fruit, 0.082 to 0.922 g/L aspartame and 0 to 4.0 g/L guar gum, following a two-factor central composite rotatable design. The formulation containing 0.6 g/L aspartame and 0.6 g/L guar gum was selected by Response Surface Methodology. Chemical composition, calorie content, rheological behavior and acceptability of the selected sample, the control sample with added sucrose and of both low-calorie and regular commercial nectars were compared. Acceptability data were analyzed by ANOVA, signal to noise ratio and Internal Preference Mapping. Acceptability of the selected sample did not differ from that of the control sample nor from some commercial nectars.