INS and diabetes mellitus: After analysis, we obtained four categories: 1) beliefs related to starting insulin treatment: treatment of choice after failure of other drugs, cures diabetes, regulates sugar, fear of injectables; 2) beliefs related to treatment adherence: decompensation for not using insulin, insulin is necessary to live; 3) beliefs related to alternative therapies and cost: use of alternative therapies, high cost of insulin; and 4) myths related to the use of insulin: generates dependence, dependence for insulin administration, negative effects of insulin.