The objective of this study is to diagnose vitamin D deficiency for which rule based Decision Support System (DSS) was used. This diagnosis task was achieved through neuro-fuzzy classifier. For this, we constructed an ontology related to food supplements for the management of vitamin D deficiency. The Semantic Web Rule Language (SWRL) is used to create rules corresponding to vitamin D deficiency management. Finally, Java Expert System Shell (JESS) has to be used for reasoning, which provides appropriate food items for vitamin D deficiency management.