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Background: Tirzepatide is a novel glucagon-like peptide 1/glucose-dependent insulinotropic peptide (GLP-1/GIP) receptor agonist. It was recently approved for diabetes control and weight reduction in non-diabetic patients. Case description: We report the first case of ketoacidosis after the use of tirzepatide in an obese non-diabetic patient, secondary to the possibility of starvation ketoacidosis and insulin resistance. Conclusion: The dual-acting GLP-1 and GIP receptor agonists, tirzepatide, can induce ketoacidosis in obese non-diabetic patients.