Evaluate nutrition literacy in uninsured subjects with diabetes mellitus (DM) who presented to free diabetes management classes. DesignThis single-site, cross-sectional observational study recruited thirty subjects from a free clinic for uninsured patients to attend diabetes mellitus, self-management classes. Before starting the classes, DM care-related data were collected, and subjects were administered the Nutrition Literacy Assessment Instrument (NLit). The assessment covers six subscales in nutrition and categorizes results into three possible categories: the likelihood of poor nutrition literacy (NLit Score ≤ 44), the possibility of poor nutrition literacy (NLit Score-45-57), and the likelihood of good nutrition literacy (NLit score ≥ 58). ResultsMedian glycated haemoglobin (HbA1c) was 7.45% for study participants. The mean NLit score was 38.1 (SD ± 9.4), correlating with a likelihood of poor nutrition literacy. All participants had either likelihood or the possibility of poor nutrition literacy based on the NLit Assessment. There were no participants who scored in the range of likelihood of good nutrition literacy. Subjects who scored in the range of likelihood of poor nutrition literacy had a significantly higher mean HbA1c (8.6 %) than those who scored in the possibility of poor nutrition literacy (6.9 %, p=0.005). ConclusionsPoor nutrition literacy is associated with worse glycemic control among uninsured subjects with diabetes mellitus.