TG/HDL-C ratio and visceral adiposity index may be useful in assessment of insulin resistance in adults with type 1 diabetes in clinical practice.

•Insulin resistance (IR) is an important clinical problem in type 1 diabetes.•Triglyceride/high-density lipoprotein cholesterol and visceral adiposity index are simple tools calculated from lipid profile.•Lipid profile should be assessed once a year in type 1 diabetes.•IR should be assessed in patients with type 1 diabetes.•Triglyceride/high-density lipoprotein cholesterol and visceral adiposity index may be markers of IR in type 1 diabetes.