After four weeks of receiving two doses of the Moderna mRNA vaccine and passing mild phases of fever and malaise at the time of vaccination, the patient got sudden anorexia, nausea, vomiting, and lab reports of high HbA1c, low peptide C, poor glycemic control, and insulin autoantibodies formation, diagnosing it as T1DM and meeting the criteria of autoimmune/auto-inflammatory syndrome induced by adjuvants (ASIA) syndrome. Here, INS is linked to type 1 diabetes mellitus.