It depends. If you were otherwise fit, healthy and at an ideal body weight before liposuction with only few bulges that got corrected with liposuction as they were stubborn fatty deposits, then probably no special dieting will be required. But if you are overweight to begin with and liposuction took care of your stubborn area, then you should be asked to continue with diet plan to get rid of the fat elsewhere on your body or maintain your overall weight to keep the rewards of liposuction maintained.