INS and diabetes mellitus: In a multivariable logistic regression model controlling for age, sex, education, diabetes duration, HbA1c value and insulin use, the factor that most increased the odds of ever visiting a dietician was being treated by a diabetes specialist rather than family physician (adjusted OR: 3.89, 95% CI: 2.31–6.58) (Table 2A and S4 Table in S1 File).